src/content/renderer/accessibility/blink_ax_tree_source.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/renderer/accessibility/blink_ax_tree_source.h"
   6
   7 #include <set>
   8
   9 #include "base/strings/string_number_conversions.h"
  10 #include "base/strings/string_util.h"
  11 #include "base/strings/utf_string_conversions.h"
  12 #include "content/renderer/accessibility/blink_ax_enum_conversion.h"
  13 #include "content/renderer/browser_plugin/browser_plugin.h"
  14 #include "content/renderer/render_frame_impl.h"
  15 #include "content/renderer/render_frame_proxy.h"
  16 #include "content/renderer/render_view_impl.h"
  17 #include "third_party/WebKit/public/platform/WebRect.h"
  18 #include "third_party/WebKit/public/platform/WebSize.h"
  19 #include "third_party/WebKit/public/platform/WebString.h"
  20 #include "third_party/WebKit/public/platform/WebVector.h"
  21 #include "third_party/WebKit/public/web/WebAXEnums.h"
  22 #include "third_party/WebKit/public/web/WebAXObject.h"
  23 #include "third_party/WebKit/public/web/WebDocument.h"
  24 #include "third_party/WebKit/public/web/WebDocumentType.h"
  25 #include "third_party/WebKit/public/web/WebElement.h"
  26 #include "third_party/WebKit/public/web/WebFormControlElement.h"
  27 #include "third_party/WebKit/public/web/WebFrame.h"
  28 #include "third_party/WebKit/public/web/WebLocalFrame.h"
  29 #include "third_party/WebKit/public/web/WebNode.h"
  30 #include "third_party/WebKit/public/web/WebPlugin.h"
  31 #include "third_party/WebKit/public/web/WebPluginContainer.h"
  32 #include "third_party/WebKit/public/web/WebView.h"
  33
  34 using base::ASCIIToUTF16;
  35 using base::UTF16ToUTF8;
  36 using blink::WebAXObject;
  37 using blink::WebDocument;
  38 using blink::WebDocumentType;
  39 using blink::WebElement;
  40 using blink::WebLocalFrame;
  41 using blink::WebNode;
  42 using blink::WebPlugin;
  43 using blink::WebPluginContainer;
  44 using blink::WebVector;
  45 using blink::WebView;
  46
  47 namespace content {
  48
  49 namespace {
  50
  51 // Returns true if |ancestor| is the first unignored parent of |child|,
  52 // which means that when walking up the parent chain from |child|,
  53 // |ancestor| is the *first* ancestor that isn't marked as
  54 // accessibilityIsIgnored().
  55 bool IsParentUnignoredOf(WebAXObject ancestor,
  56                          WebAXObject child) {
  57   WebAXObject parent = child.parentObject();
  58   while (!parent.isDetached() && parent.accessibilityIsIgnored())
  59     parent = parent.parentObject();
  60   return parent.equals(ancestor);
  61 }
  62
  63 std::string GetEquivalentAriaRoleString(const ui::AXRole role) {
  64   switch (role) {
  65     case ui::AX_ROLE_ARTICLE:
  66       return "article";
  67     case ui::AX_ROLE_BANNER:
  68       return "banner";
  69     case ui::AX_ROLE_BUTTON:
  70       return "button";
  71     case ui::AX_ROLE_COMPLEMENTARY:
  72       return "complementary";
  73     case ui::AX_ROLE_FOOTER:
  74       return "contentinfo";
  75     case ui::AX_ROLE_HORIZONTAL_RULE:
  76       return "separator";
  77     case ui::AX_ROLE_IMAGE:
  78       return "img";
  79     case ui::AX_ROLE_MAIN:
  80       return "main";
  81     case ui::AX_ROLE_NAVIGATION:
  82       return "navigation";
  83     case ui::AX_ROLE_RADIO_BUTTON:
  84       return "radio";
  85     case ui::AX_ROLE_REGION:
  86       return "region";
  87     case ui::AX_ROLE_SLIDER:
  88       return "slider";
  89     default:
  90       break;
  91   }
  92
  93   return std::string();
  94 }
  95
  96 void AddIntListAttributeFromWebObjects(ui::AXIntListAttribute attr,
  97                                        WebVector<WebAXObject> objects,
  98                                        ui::AXNodeData* dst) {
  99   std::vector<int32> ids;
 100   for(size_t i = 0; i < objects.size(); i++)
 101     ids.push_back(objects[i].axID());
 102   if (ids.size() > 0)
 103     dst->AddIntListAttribute(attr, ids);
 104 }
 105
 106 }  // Anonymous namespace
 107
 108 BlinkAXTreeSource::BlinkAXTreeSource(RenderFrameImpl* render_frame)
 109     : render_frame_(render_frame),
 110       node_to_frame_routing_id_map_(NULL),
 111       node_to_browser_plugin_instance_id_map_(NULL),
 112       accessibility_focus_id_(-1) {
 113 }
 114
 115 BlinkAXTreeSource::~BlinkAXTreeSource() {
 116 }
 117
 118 bool BlinkAXTreeSource::IsInTree(blink::WebAXObject node) const {
 119   const blink::WebAXObject& root = GetRoot();
 120   while (IsValid(node)) {
 121     if (node.equals(root))
 122       return true;
 123     node = GetParent(node);
 124   }
 125   return false;
 126 }
 127
 128 void BlinkAXTreeSource::CollectChildFrameIdMapping(
 129     std::map<int32, int>* node_to_frame_routing_id_map,
 130     std::map<int32, int>* node_to_browser_plugin_instance_id_map) {
 131   node_to_frame_routing_id_map_ = node_to_frame_routing_id_map;
 132   node_to_browser_plugin_instance_id_map_ =
 133       node_to_browser_plugin_instance_id_map;
 134 }
 135
 136 blink::WebAXObject BlinkAXTreeSource::GetRoot() const {
 137   return GetMainDocument().accessibilityObject();
 138 }
 139
 140 blink::WebAXObject BlinkAXTreeSource::GetFromId(int32 id) const {
 141   return GetMainDocument().accessibilityObjectFromID(id);
 142 }
 143
 144 int32 BlinkAXTreeSource::GetId(blink::WebAXObject node) const {
 145   return node.axID();
 146 }
 147
 148 void BlinkAXTreeSource::GetChildren(
 149     blink::WebAXObject parent,
 150     std::vector<blink::WebAXObject>* out_children) const {
 151   if (parent.role() == blink::WebAXRoleStaticText) {
 152     blink::WebAXObject ancestor = parent;
 153     while (!ancestor.isDetached()) {
 154       if (ancestor.axID() == accessibility_focus_id_) {
 155         parent.loadInlineTextBoxes();
 156         break;
 157       }
 158       ancestor = ancestor.parentObject();
 159     }
 160   }
 161
 162   bool is_iframe = false;
 163   WebNode node = parent.node();
 164   if (!node.isNull() && node.isElementNode()) {
 165     WebElement element = node.to<WebElement>();
 166     is_iframe = (element.tagName() == ASCIIToUTF16("IFRAME"));
 167   }
 168
 169   for (unsigned i = 0; i < parent.childCount(); i++) {
 170     blink::WebAXObject child = parent.childAt(i);
 171
 172     // The child may be invalid due to issues in blink accessibility code.
 173     if (child.isDetached())
 174       continue;
 175
 176     // Skip children whose parent isn't |parent|.
 177     // As an exception, include children of an iframe element.
 178     if (!is_iframe && !IsParentUnignoredOf(parent, child))
 179       continue;
 180
 181     out_children->push_back(child);
 182   }
 183 }
 184
 185 blink::WebAXObject BlinkAXTreeSource::GetParent(
 186     blink::WebAXObject node) const {
 187   // Blink returns ignored objects when walking up the parent chain,
 188   // we have to skip those here. Also, stop when we get to the root
 189   // element.
 190   blink::WebAXObject root = GetRoot();
 191   do {
 192     if (node.equals(root))
 193       return blink::WebAXObject();
 194     node = node.parentObject();
 195   } while (!node.isDetached() && node.accessibilityIsIgnored());
 196
 197   return node;
 198 }
 199
 200 bool BlinkAXTreeSource::IsValid(blink::WebAXObject node) const {
 201   return !node.isDetached();  // This also checks if it's null.
 202 }
 203
 204 bool BlinkAXTreeSource::IsEqual(blink::WebAXObject node1,
 205                                 blink::WebAXObject node2) const {
 206   return node1.equals(node2);
 207 }
 208
 209 blink::WebAXObject BlinkAXTreeSource::GetNull() const {
 210   return blink::WebAXObject();
 211 }
 212
 213 void BlinkAXTreeSource::SerializeNode(blink::WebAXObject src,
 214                                       ui::AXNodeData* dst) const {
 215   dst->role = AXRoleFromBlink(src.role());
 216   dst->state = AXStateFromBlink(src);
 217   dst->location = src.boundingBoxRect();
 218   dst->id = src.axID();
 219   std::string name = UTF16ToUTF8(src.title());
 220
 221   std::string value;
 222   if (src.valueDescription().length()) {
 223     dst->AddStringAttribute(ui::AX_ATTR_VALUE,
 224                             UTF16ToUTF8(src.valueDescription()));
 225   } else {
 226     dst->AddStringAttribute(ui::AX_ATTR_VALUE, UTF16ToUTF8(src.stringValue()));
 227   }
 228
 229   if (dst->role == ui::AX_ROLE_COLOR_WELL) {
 230     int r, g, b;
 231     src.colorValue(r, g, b);
 232     dst->AddIntAttribute(ui::AX_ATTR_COLOR_VALUE_RED, r);
 233     dst->AddIntAttribute(ui::AX_ATTR_COLOR_VALUE_GREEN, g);
 234     dst->AddIntAttribute(ui::AX_ATTR_COLOR_VALUE_BLUE, b);
 235   }
 236
 237   if (dst->role == ui::AX_ROLE_INLINE_TEXT_BOX) {
 238     dst->AddIntAttribute(ui::AX_ATTR_TEXT_DIRECTION,
 239                          AXTextDirectionFromBlink(src.textDirection()));
 240
 241     WebVector<int> src_character_offsets;
 242     src.characterOffsets(src_character_offsets);
 243     std::vector<int32> character_offsets;
 244     character_offsets.reserve(src_character_offsets.size());
 245     for (size_t i = 0; i < src_character_offsets.size(); ++i)
 246       character_offsets.push_back(src_character_offsets[i]);
 247     dst->AddIntListAttribute(ui::AX_ATTR_CHARACTER_OFFSETS, character_offsets);
 248
 249     WebVector<int> src_word_starts;
 250     WebVector<int> src_word_ends;
 251     src.wordBoundaries(src_word_starts, src_word_ends);
 252     std::vector<int32> word_starts;
 253     std::vector<int32> word_ends;
 254     word_starts.reserve(src_word_starts.size());
 255     word_ends.reserve(src_word_starts.size());
 256     for (size_t i = 0; i < src_word_starts.size(); ++i) {
 257       word_starts.push_back(src_word_starts[i]);
 258       word_ends.push_back(src_word_ends[i]);
 259     }
 260     dst->AddIntListAttribute(ui::AX_ATTR_WORD_STARTS, word_starts);
 261     dst->AddIntListAttribute(ui::AX_ATTR_WORD_ENDS, word_ends);
 262   }
 263
 264   if (src.accessKey().length()) {
 265     dst->AddStringAttribute(ui::AX_ATTR_ACCESS_KEY,
 266     UTF16ToUTF8(src.accessKey()));
 267   }
 268   if (src.actionVerb().length())
 269     dst->AddStringAttribute(ui::AX_ATTR_ACTION, UTF16ToUTF8(src.actionVerb()));
 270   if (src.isAriaReadOnly())
 271     dst->AddBoolAttribute(ui::AX_ATTR_ARIA_READONLY, true);
 272   if (src.isButtonStateMixed())
 273     dst->AddBoolAttribute(ui::AX_ATTR_BUTTON_MIXED, true);
 274   if (src.canSetValueAttribute())
 275     dst->AddBoolAttribute(ui::AX_ATTR_CAN_SET_VALUE, true);
 276   if (src.accessibilityDescription().length()) {
 277     dst->AddStringAttribute(ui::AX_ATTR_DESCRIPTION,
 278                             UTF16ToUTF8(src.accessibilityDescription()));
 279   }
 280   if (src.hasComputedStyle()) {
 281     dst->AddStringAttribute(ui::AX_ATTR_DISPLAY,
 282                             UTF16ToUTF8(src.computedStyleDisplay()));
 283   }
 284   if (src.helpText().length())
 285     dst->AddStringAttribute(ui::AX_ATTR_HELP, UTF16ToUTF8(src.helpText()));
 286   if (src.keyboardShortcut().length()) {
 287     dst->AddStringAttribute(ui::AX_ATTR_SHORTCUT,
 288                             UTF16ToUTF8(src.keyboardShortcut()));
 289   }
 290   if (!src.titleUIElement().isDetached()) {
 291     dst->AddIntAttribute(ui::AX_ATTR_TITLE_UI_ELEMENT,
 292                          src.titleUIElement().axID());
 293   }
 294   if (!src.ariaActiveDescendant().isDetached()) {
 295     dst->AddIntAttribute(ui::AX_ATTR_ACTIVEDESCENDANT_ID,
 296                          src.ariaActiveDescendant().axID());
 297   }
 298
 299   if (!src.url().isEmpty())
 300     dst->AddStringAttribute(ui::AX_ATTR_URL, src.url().spec());
 301
 302   if (dst->role == ui::AX_ROLE_HEADING)
 303     dst->AddIntAttribute(ui::AX_ATTR_HIERARCHICAL_LEVEL, src.headingLevel());
 304   else if ((dst->role == ui::AX_ROLE_TREE_ITEM ||
 305             dst->role == ui::AX_ROLE_ROW) &&
 306            src.hierarchicalLevel() > 0) {
 307     dst->AddIntAttribute(ui::AX_ATTR_HIERARCHICAL_LEVEL,
 308                          src.hierarchicalLevel());
 309   }
 310
 311   // Treat the active list box item as focused.
 312   if (dst->role == ui::AX_ROLE_LIST_BOX_OPTION &&
 313       src.isSelectedOptionActive()) {
 314     dst->state |= (1 << ui::AX_STATE_FOCUSED);
 315   }
 316
 317   if (src.canvasHasFallbackContent())
 318     dst->AddBoolAttribute(ui::AX_ATTR_CANVAS_HAS_FALLBACK, true);
 319
 320   WebNode node = src.node();
 321   bool is_iframe = false;
 322
 323   if (!node.isNull() && node.isElementNode()) {
 324     WebElement element = node.to<WebElement>();
 325     is_iframe = (element.tagName() == ASCIIToUTF16("IFRAME"));
 326
 327     // TODO(ctguil): The tagName in WebKit is lower cased but
 328     // HTMLElement::nodeName calls localNameUpper. Consider adding
 329     // a WebElement method that returns the original lower cased tagName.
 330     dst->AddStringAttribute(
 331         ui::AX_ATTR_HTML_TAG,
 332         base::StringToLowerASCII(UTF16ToUTF8(element.tagName())));
 333     for (unsigned i = 0; i < element.attributeCount(); ++i) {
 334       std::string name = base::StringToLowerASCII(UTF16ToUTF8(
 335           element.attributeLocalName(i)));
 336       std::string value = UTF16ToUTF8(element.attributeValue(i));
 337       dst->html_attributes.push_back(std::make_pair(name, value));
 338     }
 339
 340     if (dst->role == ui::AX_ROLE_EDITABLE_TEXT ||
 341         dst->role == ui::AX_ROLE_TEXT_AREA ||
 342         dst->role == ui::AX_ROLE_TEXT_FIELD) {
 343       dst->AddIntAttribute(ui::AX_ATTR_TEXT_SEL_START, src.selectionStart());
 344       dst->AddIntAttribute(ui::AX_ATTR_TEXT_SEL_END, src.selectionEnd());
 345
 346       WebVector<int> src_line_breaks;
 347       src.lineBreaks(src_line_breaks);
 348       if (src_line_breaks.size() > 0) {
 349         std::vector<int32> line_breaks;
 350         line_breaks.reserve(src_line_breaks.size());
 351         for (size_t i = 0; i < src_line_breaks.size(); ++i)
 352           line_breaks.push_back(src_line_breaks[i]);
 353         dst->AddIntListAttribute(ui::AX_ATTR_LINE_BREAKS, line_breaks);
 354       }
 355
 356       if (dst->role == ui::AX_ROLE_TEXT_FIELD &&
 357           src.textInputType().length()) {
 358         dst->AddStringAttribute(ui::AX_ATTR_TEXT_INPUT_TYPE,
 359                                 UTF16ToUTF8(src.textInputType()));
 360       }
 361     }
 362
 363     // ARIA role.
 364     if (element.hasAttribute("role")) {
 365       dst->AddStringAttribute(ui::AX_ATTR_ROLE,
 366                               UTF16ToUTF8(element.getAttribute("role")));
 367     } else {
 368       std::string role = GetEquivalentAriaRoleString(dst->role);
 369       if (!role.empty())
 370         dst->AddStringAttribute(ui::AX_ATTR_ROLE, role);
 371     }
 372
 373     // Browser plugin (used in a <webview>).
 374     if (node_to_browser_plugin_instance_id_map_) {
 375       BrowserPlugin* browser_plugin = BrowserPlugin::GetFromNode(element);
 376       if (browser_plugin) {
 377         (*node_to_browser_plugin_instance_id_map_)[dst->id] =
 378             browser_plugin->browser_plugin_instance_id();
 379         dst->AddBoolAttribute(ui::AX_ATTR_IS_AX_TREE_HOST, true);
 380       }
 381     }
 382   }
 383
 384   if (src.isInLiveRegion()) {
 385     dst->AddBoolAttribute(ui::AX_ATTR_LIVE_ATOMIC, src.liveRegionAtomic());
 386     dst->AddBoolAttribute(ui::AX_ATTR_LIVE_BUSY, src.liveRegionBusy());
 387     dst->AddStringAttribute(ui::AX_ATTR_LIVE_STATUS,
 388                             UTF16ToUTF8(src.liveRegionStatus()));
 389     dst->AddStringAttribute(ui::AX_ATTR_LIVE_RELEVANT,
 390                             UTF16ToUTF8(src.liveRegionRelevant()));
 391     dst->AddBoolAttribute(ui::AX_ATTR_CONTAINER_LIVE_ATOMIC,
 392                           src.containerLiveRegionAtomic());
 393     dst->AddBoolAttribute(ui::AX_ATTR_CONTAINER_LIVE_BUSY,
 394                           src.containerLiveRegionBusy());
 395     dst->AddStringAttribute(ui::AX_ATTR_CONTAINER_LIVE_STATUS,
 396                             UTF16ToUTF8(src.containerLiveRegionStatus()));
 397     dst->AddStringAttribute(ui::AX_ATTR_CONTAINER_LIVE_RELEVANT,
 398                             UTF16ToUTF8(src.containerLiveRegionRelevant()));
 399   }
 400
 401   if (dst->role == ui::AX_ROLE_PROGRESS_INDICATOR ||
 402       dst->role == ui::AX_ROLE_SCROLL_BAR ||
 403       dst->role == ui::AX_ROLE_SLIDER ||
 404       dst->role == ui::AX_ROLE_SPIN_BUTTON) {
 405     dst->AddFloatAttribute(ui::AX_ATTR_VALUE_FOR_RANGE, src.valueForRange());
 406     dst->AddFloatAttribute(ui::AX_ATTR_MAX_VALUE_FOR_RANGE,
 407                            src.maxValueForRange());
 408     dst->AddFloatAttribute(ui::AX_ATTR_MIN_VALUE_FOR_RANGE,
 409                            src.minValueForRange());
 410   }
 411
 412   if (dst->role == ui::AX_ROLE_DOCUMENT ||
 413       dst->role == ui::AX_ROLE_WEB_AREA) {
 414     dst->AddStringAttribute(ui::AX_ATTR_HTML_TAG, "#document");
 415     const WebDocument& document = src.document();
 416     if (name.empty())
 417       name = UTF16ToUTF8(document.title());
 418     dst->AddStringAttribute(ui::AX_ATTR_DOC_TITLE,
 419                             UTF16ToUTF8(document.title()));
 420     dst->AddStringAttribute(ui::AX_ATTR_DOC_URL, document.url().spec());
 421     dst->AddStringAttribute(
 422         ui::AX_ATTR_DOC_MIMETYPE,
 423         document.isXHTMLDocument() ? "text/xhtml" : "text/html");
 424     dst->AddBoolAttribute(ui::AX_ATTR_DOC_LOADED, src.isLoaded());
 425     dst->AddFloatAttribute(ui::AX_ATTR_DOC_LOADING_PROGRESS,
 426                            src.estimatedLoadingProgress());
 427
 428     const WebDocumentType& doctype = document.doctype();
 429     if (!doctype.isNull()) {
 430       dst->AddStringAttribute(ui::AX_ATTR_DOC_DOCTYPE,
 431                               UTF16ToUTF8(doctype.name()));
 432     }
 433
 434     const gfx::Size& scroll_offset = document.scrollOffset();
 435     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_X, scroll_offset.width());
 436     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_Y, scroll_offset.height());
 437
 438     const gfx::Size& min_offset = document.minimumScrollOffset();
 439     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_X_MIN, min_offset.width());
 440     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_Y_MIN, min_offset.height());
 441
 442     const gfx::Size& max_offset = document.maximumScrollOffset();
 443     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_X_MAX, max_offset.width());
 444     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_Y_MAX, max_offset.height());
 445
 446     if (node_to_frame_routing_id_map_ && !src.equals(GetRoot())) {
 447       WebLocalFrame* frame = document.frame();
 448       RenderFrameImpl* render_frame = RenderFrameImpl::FromWebFrame(frame);
 449       if (render_frame) {
 450         (*node_to_frame_routing_id_map_)[dst->id] =
 451             render_frame->GetRoutingID();
 452         dst->AddBoolAttribute(ui::AX_ATTR_IS_AX_TREE_HOST, true);
 453       } else {
 454         RenderFrameProxy* render_frame_proxy =
 455             RenderFrameProxy::FromWebFrame(frame);
 456         if (render_frame_proxy) {
 457           (*node_to_frame_routing_id_map_)[dst->id] =
 458               render_frame_proxy->routing_id();
 459           dst->AddBoolAttribute(ui::AX_ATTR_IS_AX_TREE_HOST, true);
 460         }
 461       }
 462     }
 463   }
 464
 465   if (dst->role == ui::AX_ROLE_TABLE) {
 466     int column_count = src.columnCount();
 467     int row_count = src.rowCount();
 468     if (column_count > 0 && row_count > 0) {
 469       std::set<int32> unique_cell_id_set;
 470       std::vector<int32> cell_ids;
 471       std::vector<int32> unique_cell_ids;
 472       dst->AddIntAttribute(ui::AX_ATTR_TABLE_COLUMN_COUNT, column_count);
 473       dst->AddIntAttribute(ui::AX_ATTR_TABLE_ROW_COUNT, row_count);
 474       WebAXObject header = src.headerContainerObject();
 475       if (!header.isDetached())
 476         dst->AddIntAttribute(ui::AX_ATTR_TABLE_HEADER_ID, header.axID());
 477       for (int i = 0; i < column_count * row_count; ++i) {
 478         WebAXObject cell = src.cellForColumnAndRow(
 479             i % column_count, i / column_count);
 480         int cell_id = -1;
 481         if (!cell.isDetached()) {
 482           cell_id = cell.axID();
 483           if (unique_cell_id_set.find(cell_id) == unique_cell_id_set.end()) {
 484             unique_cell_id_set.insert(cell_id);
 485             unique_cell_ids.push_back(cell_id);
 486           }
 487         }
 488         cell_ids.push_back(cell_id);
 489       }
 490       dst->AddIntListAttribute(ui::AX_ATTR_CELL_IDS, cell_ids);
 491       dst->AddIntListAttribute(ui::AX_ATTR_UNIQUE_CELL_IDS, unique_cell_ids);
 492     }
 493   }
 494
 495   if (dst->role == ui::AX_ROLE_ROW) {
 496     dst->AddIntAttribute(ui::AX_ATTR_TABLE_ROW_INDEX, src.rowIndex());
 497     WebAXObject header = src.rowHeader();
 498     if (!header.isDetached())
 499       dst->AddIntAttribute(ui::AX_ATTR_TABLE_ROW_HEADER_ID, header.axID());
 500   }
 501
 502   if (dst->role == ui::AX_ROLE_COLUMN) {
 503     dst->AddIntAttribute(ui::AX_ATTR_TABLE_COLUMN_INDEX, src.columnIndex());
 504     WebAXObject header = src.columnHeader();
 505     if (!header.isDetached())
 506       dst->AddIntAttribute(ui::AX_ATTR_TABLE_COLUMN_HEADER_ID, header.axID());
 507   }
 508
 509   if (dst->role == ui::AX_ROLE_CELL ||
 510       dst->role == ui::AX_ROLE_ROW_HEADER ||
 511       dst->role == ui::AX_ROLE_COLUMN_HEADER) {
 512     dst->AddIntAttribute(ui::AX_ATTR_TABLE_CELL_COLUMN_INDEX,
 513                          src.cellColumnIndex());
 514     dst->AddIntAttribute(ui::AX_ATTR_TABLE_CELL_COLUMN_SPAN,
 515                          src.cellColumnSpan());
 516     dst->AddIntAttribute(ui::AX_ATTR_TABLE_CELL_ROW_INDEX, src.cellRowIndex());
 517     dst->AddIntAttribute(ui::AX_ATTR_TABLE_CELL_ROW_SPAN, src.cellRowSpan());
 518   }
 519
 520   dst->AddStringAttribute(ui::AX_ATTR_NAME, name);
 521
 522   // Add the ids of *indirect* children - those who are children of this node,
 523   // but whose parent is *not* this node. One example is a table
 524   // cell, which is a child of both a row and a column. Because the cell's
 525   // parent is the row, the row adds it as a child, and the column adds it
 526   // as an indirect child.
 527   int child_count = src.childCount();
 528   for (int i = 0; i < child_count; ++i) {
 529     WebAXObject child = src.childAt(i);
 530     std::vector<int32> indirect_child_ids;
 531     if (!is_iframe && !child.isDetached() && !IsParentUnignoredOf(src, child))
 532       indirect_child_ids.push_back(child.axID());
 533     if (indirect_child_ids.size() > 0) {
 534       dst->AddIntListAttribute(
 535           ui::AX_ATTR_INDIRECT_CHILD_IDS, indirect_child_ids);
 536     }
 537   }
 538
 539   WebVector<WebAXObject> controls;
 540   if (src.ariaControls(controls))
 541     AddIntListAttributeFromWebObjects(ui::AX_ATTR_CONTROLS_IDS, controls, dst);
 542
 543   WebVector<WebAXObject> describedby;
 544   if (src.ariaDescribedby(describedby)) {
 545     AddIntListAttributeFromWebObjects(
 546         ui::AX_ATTR_DESCRIBEDBY_IDS, describedby, dst);
 547   }
 548
 549   WebVector<WebAXObject> flowTo;
 550   if (src.ariaFlowTo(flowTo))
 551     AddIntListAttributeFromWebObjects(ui::AX_ATTR_FLOWTO_IDS, flowTo, dst);
 552
 553   WebVector<WebAXObject> labelledby;
 554   if (src.ariaLabelledby(labelledby)) {
 555     AddIntListAttributeFromWebObjects(
 556         ui::AX_ATTR_LABELLEDBY_IDS, labelledby, dst);
 557   }
 558
 559   WebVector<WebAXObject> owns;
 560   if (src.ariaOwns(owns))
 561     AddIntListAttributeFromWebObjects(ui::AX_ATTR_OWNS_IDS, owns, dst);
 562 }
 563
 564 blink::WebDocument BlinkAXTreeSource::GetMainDocument() const {
 565   if (render_frame_ && render_frame_->GetWebFrame())
 566     return render_frame_->GetWebFrame()->document();
 567   return WebDocument();
 568 }
 569
 570 }  // namespace content