src/ppapi/proxy/ppb_var_deprecated_proxy.cc

   1 // Copyright (c) 2012 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 "ppapi/proxy/ppb_var_deprecated_proxy.h"
   6
   7 #include <stdlib.h>  // For malloc
   8
   9 #include "base/bind.h"
  10 #include "base/logging.h"
  11 #include "base/message_loop/message_loop.h"
  12 #include "ppapi/c/dev/ppb_var_deprecated.h"
  13 #include "ppapi/c/pp_var.h"
  14 #include "ppapi/c/ppb_core.h"
  15 #include "ppapi/c/ppb_var.h"
  16 #include "ppapi/proxy/host_dispatcher.h"
  17 #include "ppapi/proxy/plugin_dispatcher.h"
  18 #include "ppapi/proxy/plugin_globals.h"
  19 #include "ppapi/proxy/plugin_resource_tracker.h"
  20 #include "ppapi/proxy/plugin_var_tracker.h"
  21 #include "ppapi/proxy/ppapi_messages.h"
  22 #include "ppapi/proxy/ppp_class_proxy.h"
  23 #include "ppapi/proxy/proxy_object_var.h"
  24 #include "ppapi/proxy/serialized_var.h"
  25 #include "ppapi/shared_impl/ppb_var_shared.h"
  26 #include "ppapi/shared_impl/proxy_lock.h"
  27 #include "ppapi/shared_impl/var.h"
  28
  29 namespace ppapi {
  30 namespace proxy {
  31
  32 namespace {
  33
  34 // Used to do get the set-up information for calling a var object. If the
  35 // exception is set, returns NULL. Otherwise, computes the dispatcher for the
  36 // given var object. If the var is not a valid object, returns NULL and sets
  37 // the exception.
  38 PluginDispatcher* CheckExceptionAndGetDispatcher(const PP_Var& object,
  39                                                  PP_Var* exception) {
  40   // If an exception is already set, we don't need to do anything, just return
  41   // an error to the caller.
  42   if (exception && exception->type != PP_VARTYPE_UNDEFINED)
  43     return NULL;
  44
  45
  46   if (object.type == PP_VARTYPE_OBJECT) {
  47     // Get the dispatcher for the object.
  48     PluginDispatcher* dispatcher =
  49         PluginGlobals::Get()->plugin_var_tracker()->
  50             DispatcherForPluginObject(object);
  51     if (dispatcher)
  52       return dispatcher;
  53   }
  54
  55   // The object is invalid. This means we can't figure out which dispatcher
  56   // to use, which is OK because the call will fail anyway. Set the exception.
  57   if (exception) {
  58     *exception = StringVar::StringToPPVar(
  59         std::string("Attempting to use an invalid object"));
  60   }
  61   return NULL;
  62 }
  63
  64 // PPB_Var_Deprecated plugin ---------------------------------------------------
  65
  66 bool HasProperty(PP_Var var,
  67                  PP_Var name,
  68                  PP_Var* exception) {
  69   ProxyAutoLock lock;
  70   Dispatcher* dispatcher = CheckExceptionAndGetDispatcher(var, exception);
  71   if (!dispatcher)
  72     return false;
  73
  74   ReceiveSerializedException se(dispatcher, exception);
  75   PP_Bool result = PP_FALSE;
  76   if (!se.IsThrown()) {
  77     dispatcher->Send(new PpapiHostMsg_PPBVar_HasProperty(
  78         API_ID_PPB_VAR_DEPRECATED,
  79         SerializedVarSendInput(dispatcher, var),
  80         SerializedVarSendInput(dispatcher, name), &se, &result));
  81   }
  82   return PP_ToBool(result);
  83 }
  84
  85 bool HasMethod(PP_Var var,
  86                PP_Var name,
  87                PP_Var* exception) {
  88   ProxyAutoLock lock;
  89   Dispatcher* dispatcher = CheckExceptionAndGetDispatcher(var, exception);
  90   if (!dispatcher)
  91     return false;
  92
  93   ReceiveSerializedException se(dispatcher, exception);
  94   PP_Bool result = PP_FALSE;
  95   if (!se.IsThrown()) {
  96     dispatcher->Send(new PpapiHostMsg_PPBVar_HasMethodDeprecated(
  97         API_ID_PPB_VAR_DEPRECATED,
  98         SerializedVarSendInput(dispatcher, var),
  99         SerializedVarSendInput(dispatcher, name), &se, &result));
 100   }
 101   return PP_ToBool(result);
 102 }
 103
 104 PP_Var GetProperty(PP_Var var,
 105                    PP_Var name,
 106                    PP_Var* exception) {
 107   ProxyAutoLock lock;
 108   Dispatcher* dispatcher = CheckExceptionAndGetDispatcher(var, exception);
 109   if (!dispatcher)
 110     return PP_MakeUndefined();
 111
 112   ReceiveSerializedException se(dispatcher, exception);
 113   ReceiveSerializedVarReturnValue result;
 114   if (!se.IsThrown()) {
 115     dispatcher->Send(new PpapiHostMsg_PPBVar_GetProperty(
 116         API_ID_PPB_VAR_DEPRECATED,
 117         SerializedVarSendInput(dispatcher, var),
 118         SerializedVarSendInput(dispatcher, name), &se, &result));
 119   }
 120   return result.Return(dispatcher);
 121 }
 122
 123 void EnumerateProperties(PP_Var var,
 124                          uint32_t* property_count,
 125                          PP_Var** properties,
 126                          PP_Var* exception) {
 127   ProxyAutoLock lock;
 128   Dispatcher* dispatcher = CheckExceptionAndGetDispatcher(var, exception);
 129   if (!dispatcher) {
 130     *property_count = 0;
 131     *properties = NULL;
 132     return;
 133   }
 134
 135   ReceiveSerializedVarVectorOutParam out_vector(dispatcher,
 136                                                 property_count, properties);
 137   ReceiveSerializedException se(dispatcher, exception);
 138   if (!se.IsThrown()) {
 139     dispatcher->Send(new PpapiHostMsg_PPBVar_EnumerateProperties(
 140         API_ID_PPB_VAR_DEPRECATED,
 141         SerializedVarSendInput(dispatcher, var),
 142         out_vector.OutParam(), &se));
 143   }
 144 }
 145
 146 void SetProperty(PP_Var var,
 147                  PP_Var name,
 148                  PP_Var value,
 149                  PP_Var* exception) {
 150   ProxyAutoLock lock;
 151   Dispatcher* dispatcher = CheckExceptionAndGetDispatcher(var, exception);
 152   if (!dispatcher)
 153     return;
 154
 155   ReceiveSerializedException se(dispatcher, exception);
 156   if (!se.IsThrown()) {
 157     dispatcher->Send(new PpapiHostMsg_PPBVar_SetPropertyDeprecated(
 158         API_ID_PPB_VAR_DEPRECATED,
 159         SerializedVarSendInput(dispatcher, var),
 160         SerializedVarSendInput(dispatcher, name),
 161         SerializedVarSendInput(dispatcher, value), &se));
 162   }
 163 }
 164
 165 void RemoveProperty(PP_Var var,
 166                     PP_Var name,
 167                     PP_Var* exception) {
 168   ProxyAutoLock lock;
 169   Dispatcher* dispatcher = CheckExceptionAndGetDispatcher(var, exception);
 170   if (!dispatcher)
 171     return;
 172
 173   ReceiveSerializedException se(dispatcher, exception);
 174   PP_Bool result = PP_FALSE;
 175   if (!se.IsThrown()) {
 176     dispatcher->Send(new PpapiHostMsg_PPBVar_DeleteProperty(
 177         API_ID_PPB_VAR_DEPRECATED,
 178         SerializedVarSendInput(dispatcher, var),
 179         SerializedVarSendInput(dispatcher, name), &se, &result));
 180   }
 181 }
 182
 183 PP_Var Call(PP_Var object,
 184             PP_Var method_name,
 185             uint32_t argc,
 186             PP_Var* argv,
 187             PP_Var* exception) {
 188   ProxyAutoLock lock;
 189   Dispatcher* dispatcher = CheckExceptionAndGetDispatcher(object, exception);
 190   if (!dispatcher)
 191     return PP_MakeUndefined();
 192
 193   ReceiveSerializedVarReturnValue result;
 194   ReceiveSerializedException se(dispatcher, exception);
 195   if (!se.IsThrown()) {
 196     std::vector<SerializedVar> argv_vect;
 197     SerializedVarSendInput::ConvertVector(dispatcher, argv, argc, &argv_vect);
 198
 199     dispatcher->Send(new PpapiHostMsg_PPBVar_CallDeprecated(
 200         API_ID_PPB_VAR_DEPRECATED,
 201         SerializedVarSendInput(dispatcher, object),
 202         SerializedVarSendInput(dispatcher, method_name), argv_vect,
 203         &se, &result));
 204   }
 205   return result.Return(dispatcher);
 206 }
 207
 208 PP_Var Construct(PP_Var object,
 209                  uint32_t argc,
 210                  PP_Var* argv,
 211                  PP_Var* exception) {
 212   ProxyAutoLock lock;
 213   Dispatcher* dispatcher = CheckExceptionAndGetDispatcher(object, exception);
 214   if (!dispatcher)
 215     return PP_MakeUndefined();
 216
 217   ReceiveSerializedVarReturnValue result;
 218   ReceiveSerializedException se(dispatcher, exception);
 219   if (!se.IsThrown()) {
 220     std::vector<SerializedVar> argv_vect;
 221     SerializedVarSendInput::ConvertVector(dispatcher, argv, argc, &argv_vect);
 222
 223     dispatcher->Send(new PpapiHostMsg_PPBVar_Construct(
 224         API_ID_PPB_VAR_DEPRECATED,
 225         SerializedVarSendInput(dispatcher, object),
 226         argv_vect, &se, &result));
 227   }
 228   return result.Return(dispatcher);
 229 }
 230
 231 bool IsInstanceOf(PP_Var var,
 232                   const PPP_Class_Deprecated* ppp_class,
 233                   void** ppp_class_data) {
 234   ProxyAutoLock lock;
 235   Dispatcher* dispatcher = CheckExceptionAndGetDispatcher(var, NULL);
 236   if (!dispatcher)
 237     return false;
 238
 239   PP_Bool result = PP_FALSE;
 240   int64 class_int = static_cast<int64>(reinterpret_cast<intptr_t>(ppp_class));
 241   int64 class_data_int = 0;
 242   dispatcher->Send(new PpapiHostMsg_PPBVar_IsInstanceOfDeprecated(
 243       API_ID_PPB_VAR_DEPRECATED, SerializedVarSendInput(dispatcher, var),
 244       class_int, &class_data_int, &result));
 245   *ppp_class_data =
 246       reinterpret_cast<void*>(static_cast<intptr_t>(class_data_int));
 247   return PP_ToBool(result);
 248 }
 249
 250 PP_Var CreateObject(PP_Instance instance,
 251                     const PPP_Class_Deprecated* ppp_class,
 252                     void* ppp_class_data) {
 253   ProxyAutoLock lock;
 254   Dispatcher* dispatcher = PluginDispatcher::GetForInstance(instance);
 255   if (!dispatcher)
 256     return PP_MakeUndefined();
 257
 258   PluginVarTracker* tracker = PluginGlobals::Get()->plugin_var_tracker();
 259   if (tracker->IsPluginImplementedObjectAlive(ppp_class_data))
 260     return PP_MakeUndefined();  // Object already exists with this user data.
 261
 262   ReceiveSerializedVarReturnValue result;
 263   int64 class_int = static_cast<int64>(reinterpret_cast<intptr_t>(ppp_class));
 264   int64 data_int =
 265       static_cast<int64>(reinterpret_cast<intptr_t>(ppp_class_data));
 266   dispatcher->Send(new PpapiHostMsg_PPBVar_CreateObjectDeprecated(
 267       API_ID_PPB_VAR_DEPRECATED, instance, class_int, data_int,
 268       &result));
 269   PP_Var ret_var = result.Return(dispatcher);
 270
 271   // Register this object as being implemented by the plugin.
 272   if (ret_var.type == PP_VARTYPE_OBJECT) {
 273     tracker->PluginImplementedObjectCreated(instance, ret_var,
 274                                             ppp_class, ppp_class_data);
 275   }
 276   return ret_var;
 277 }
 278
 279 InterfaceProxy* CreateVarDeprecatedProxy(Dispatcher* dispatcher) {
 280   return new PPB_Var_Deprecated_Proxy(dispatcher );
 281 }
 282
 283 }  // namespace
 284
 285 PPB_Var_Deprecated_Proxy::PPB_Var_Deprecated_Proxy(
 286     Dispatcher* dispatcher)
 287     : InterfaceProxy(dispatcher),
 288       ppb_var_impl_(NULL),
 289       task_factory_(this) {
 290   if (!dispatcher->IsPlugin()) {
 291     ppb_var_impl_ = static_cast<const PPB_Var_Deprecated*>(
 292         dispatcher->local_get_interface()(PPB_VAR_DEPRECATED_INTERFACE));
 293   }
 294 }
 295
 296 PPB_Var_Deprecated_Proxy::~PPB_Var_Deprecated_Proxy() {
 297 }
 298
 299 // static
 300 const InterfaceProxy::Info* PPB_Var_Deprecated_Proxy::GetInfo() {
 301   static const PPB_Var_Deprecated var_deprecated_interface = {
 302     ppapi::PPB_Var_Shared::GetVarInterface1_0()->AddRef,
 303     ppapi::PPB_Var_Shared::GetVarInterface1_0()->Release,
 304     ppapi::PPB_Var_Shared::GetVarInterface1_0()->VarFromUtf8,
 305     ppapi::PPB_Var_Shared::GetVarInterface1_0()->VarToUtf8,
 306     &HasProperty,
 307     &HasMethod,
 308     &GetProperty,
 309     &EnumerateProperties,
 310     &SetProperty,
 311     &RemoveProperty,
 312     &Call,
 313     &Construct,
 314     &IsInstanceOf,
 315     &CreateObject
 316   };
 317
 318   static const Info info = {
 319     &var_deprecated_interface,
 320     PPB_VAR_DEPRECATED_INTERFACE,
 321     API_ID_PPB_VAR_DEPRECATED,
 322     false,
 323     &CreateVarDeprecatedProxy,
 324   };
 325   return &info;
 326 }
 327
 328 bool PPB_Var_Deprecated_Proxy::OnMessageReceived(const IPC::Message& msg) {
 329   if (!dispatcher()->permissions().HasPermission(PERMISSION_DEV))
 330     return false;
 331
 332   // Prevent the dispatcher from going away during a call to Call or other
 333   // function that could mutate the DOM. This must happen OUTSIDE of
 334   // the message handlers since the SerializedVars use the dispatcher upon
 335   // return of the function (converting the SerializedVarReturnValue/OutParam
 336   // to a SerializedVar in the destructor).
 337   ScopedModuleReference death_grip(dispatcher());
 338
 339   bool handled = true;
 340   IPC_BEGIN_MESSAGE_MAP(PPB_Var_Deprecated_Proxy, msg)
 341     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBVar_AddRefObject, OnMsgAddRefObject)
 342     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBVar_ReleaseObject, OnMsgReleaseObject)
 343     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBVar_HasProperty,
 344                         OnMsgHasProperty)
 345     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBVar_HasMethodDeprecated,
 346                         OnMsgHasMethodDeprecated)
 347     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBVar_GetProperty,
 348                         OnMsgGetProperty)
 349     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBVar_DeleteProperty,
 350                         OnMsgDeleteProperty)
 351     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBVar_EnumerateProperties,
 352                         OnMsgEnumerateProperties)
 353     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBVar_SetPropertyDeprecated,
 354                         OnMsgSetPropertyDeprecated)
 355     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBVar_CallDeprecated,
 356                         OnMsgCallDeprecated)
 357     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBVar_Construct,
 358                         OnMsgConstruct)
 359     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBVar_IsInstanceOfDeprecated,
 360                         OnMsgIsInstanceOfDeprecated)
 361     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBVar_CreateObjectDeprecated,
 362                         OnMsgCreateObjectDeprecated)
 363     IPC_MESSAGE_UNHANDLED(handled = false)
 364   IPC_END_MESSAGE_MAP()
 365   // TODO(brettw) handle bad messages!
 366   return handled;
 367 }
 368
 369 void PPB_Var_Deprecated_Proxy::OnMsgAddRefObject(int64 object_id,
 370                                                  int* /* unused */) {
 371   PP_Var var = { PP_VARTYPE_OBJECT };
 372   var.value.as_id = object_id;
 373   ppb_var_impl_->AddRef(var);
 374 }
 375
 376 void PPB_Var_Deprecated_Proxy::OnMsgReleaseObject(int64 object_id) {
 377   // Ok, so this is super subtle.
 378   // When the browser side sends a sync IPC message that returns a var, and the
 379   // plugin wants to give ownership of that var to the browser, dropping all
 380   // references, it may call ReleaseObject right after returning the result.
 381   // However, the IPC system doesn't enforce strict ordering of messages in that
 382   // case, where a message that is set to unblock (e.g. a sync message, or in
 383   // our case all messages coming from the plugin) that is sent *after* the
 384   // result may be dispatched on the browser side *before* the sync send
 385   // returned (see ipc_sync_channel.cc). In this case, that means it could
 386   // release the object before it is AddRef'ed on the browser side.
 387   // To work around this, we post a task here, that will not execute before
 388   // control goes back to the main message loop, that will ensure the sync send
 389   // has returned and the browser side can take its reference before we Release.
 390   // Note: if the instance is gone by the time the task is executed, then it
 391   // will Release the objects itself and this Release will be a NOOP (aside of a
 392   // spurious warning).
 393   // TODO(piman): See if we can fix the IPC code to enforce strict ordering, and
 394   // then remove this.
 395   base::MessageLoop::current()->PostNonNestableTask(
 396       FROM_HERE,
 397       RunWhileLocked(base::Bind(&PPB_Var_Deprecated_Proxy::DoReleaseObject,
 398                                 task_factory_.GetWeakPtr(),
 399                                 object_id)));
 400 }
 401
 402 void PPB_Var_Deprecated_Proxy::OnMsgHasProperty(
 403     SerializedVarReceiveInput var,
 404     SerializedVarReceiveInput name,
 405     SerializedVarOutParam exception,
 406     PP_Bool* result) {
 407   SetAllowPluginReentrancy();
 408   *result = PP_FromBool(ppb_var_impl_->HasProperty(
 409       var.Get(dispatcher()),
 410       name.Get(dispatcher()),
 411       exception.OutParam(dispatcher())));
 412 }
 413
 414 void PPB_Var_Deprecated_Proxy::OnMsgHasMethodDeprecated(
 415     SerializedVarReceiveInput var,
 416     SerializedVarReceiveInput name,
 417     SerializedVarOutParam exception,
 418     PP_Bool* result) {
 419   SetAllowPluginReentrancy();
 420   *result = PP_FromBool(ppb_var_impl_->HasMethod(
 421       var.Get(dispatcher()),
 422       name.Get(dispatcher()),
 423       exception.OutParam(dispatcher())));
 424 }
 425
 426 void PPB_Var_Deprecated_Proxy::OnMsgGetProperty(
 427     SerializedVarReceiveInput var,
 428     SerializedVarReceiveInput name,
 429     SerializedVarOutParam exception,
 430     SerializedVarReturnValue result) {
 431   SetAllowPluginReentrancy();
 432   result.Return(dispatcher(), ppb_var_impl_->GetProperty(
 433       var.Get(dispatcher()), name.Get(dispatcher()),
 434       exception.OutParam(dispatcher())));
 435 }
 436
 437 void PPB_Var_Deprecated_Proxy::OnMsgEnumerateProperties(
 438     SerializedVarReceiveInput var,
 439     SerializedVarVectorOutParam props,
 440     SerializedVarOutParam exception) {
 441   SetAllowPluginReentrancy();
 442   ppb_var_impl_->GetAllPropertyNames(var.Get(dispatcher()),
 443       props.CountOutParam(), props.ArrayOutParam(dispatcher()),
 444       exception.OutParam(dispatcher()));
 445 }
 446
 447 void PPB_Var_Deprecated_Proxy::OnMsgSetPropertyDeprecated(
 448     SerializedVarReceiveInput var,
 449     SerializedVarReceiveInput name,
 450     SerializedVarReceiveInput value,
 451     SerializedVarOutParam exception) {
 452   SetAllowPluginReentrancy();
 453   ppb_var_impl_->SetProperty(var.Get(dispatcher()),
 454                                 name.Get(dispatcher()),
 455                                 value.Get(dispatcher()),
 456                                 exception.OutParam(dispatcher()));
 457 }
 458
 459 void PPB_Var_Deprecated_Proxy::OnMsgDeleteProperty(
 460     SerializedVarReceiveInput var,
 461     SerializedVarReceiveInput name,
 462     SerializedVarOutParam exception,
 463     PP_Bool* result) {
 464   SetAllowPluginReentrancy();
 465   ppb_var_impl_->RemoveProperty(var.Get(dispatcher()),
 466                                    name.Get(dispatcher()),
 467                                    exception.OutParam(dispatcher()));
 468   // This deprecated function doesn't actually return a value, but we re-use
 469   // the message from the non-deprecated interface with the return value.
 470   *result = PP_TRUE;
 471 }
 472
 473 void PPB_Var_Deprecated_Proxy::OnMsgCallDeprecated(
 474     SerializedVarReceiveInput object,
 475     SerializedVarReceiveInput method_name,
 476     SerializedVarVectorReceiveInput arg_vector,
 477     SerializedVarOutParam exception,
 478     SerializedVarReturnValue result) {
 479   SetAllowPluginReentrancy();
 480   uint32_t arg_count = 0;
 481   PP_Var* args = arg_vector.Get(dispatcher(), &arg_count);
 482   result.Return(dispatcher(), ppb_var_impl_->Call(
 483       object.Get(dispatcher()),
 484       method_name.Get(dispatcher()),
 485       arg_count, args,
 486       exception.OutParam(dispatcher())));
 487 }
 488
 489 void PPB_Var_Deprecated_Proxy::OnMsgConstruct(
 490     SerializedVarReceiveInput var,
 491     SerializedVarVectorReceiveInput arg_vector,
 492     SerializedVarOutParam exception,
 493     SerializedVarReturnValue result) {
 494   SetAllowPluginReentrancy();
 495   uint32_t arg_count = 0;
 496   PP_Var* args = arg_vector.Get(dispatcher(), &arg_count);
 497   result.Return(dispatcher(), ppb_var_impl_->Construct(
 498       var.Get(dispatcher()), arg_count, args,
 499       exception.OutParam(dispatcher())));
 500 }
 501
 502 void PPB_Var_Deprecated_Proxy::OnMsgIsInstanceOfDeprecated(
 503     SerializedVarReceiveInput var,
 504     int64 ppp_class,
 505     int64* ppp_class_data,
 506     PP_Bool* result) {
 507   SetAllowPluginReentrancy();
 508   *result = PPP_Class_Proxy::IsInstanceOf(ppb_var_impl_,
 509                                           var.Get(dispatcher()),
 510                                           ppp_class,
 511                                           ppp_class_data);
 512 }
 513
 514 void PPB_Var_Deprecated_Proxy::OnMsgCreateObjectDeprecated(
 515     PP_Instance instance,
 516     int64 ppp_class,
 517     int64 class_data,
 518     SerializedVarReturnValue result) {
 519   SetAllowPluginReentrancy();
 520   result.Return(dispatcher(), PPP_Class_Proxy::CreateProxiedObject(
 521       ppb_var_impl_, dispatcher(), instance, ppp_class, class_data));
 522 }
 523
 524 void PPB_Var_Deprecated_Proxy::SetAllowPluginReentrancy() {
 525   if (dispatcher()->IsPlugin())
 526     NOTREACHED();
 527   else
 528     static_cast<HostDispatcher*>(dispatcher())->set_allow_plugin_reentrancy();
 529 }
 530
 531 void PPB_Var_Deprecated_Proxy::DoReleaseObject(int64 object_id) {
 532   PP_Var var = { PP_VARTYPE_OBJECT };
 533   var.value.as_id = object_id;
 534   ppb_var_impl_->Release(var);
 535 }
 536
 537 }  // namespace proxy
 538 }  // namespace ppapi