src/chrome/service/cloud_print/print_system_xps_win.cc

   1 // Copyright 2013 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 "base/file_util.h"
   6 #include "base/strings/utf_string_conversions.h"
   7 #include "base/win/object_watcher.h"
   8 #include "base/win/scoped_bstr.h"
   9 #include "base/win/scoped_comptr.h"
  10 #include "base/win/scoped_hdc.h"
  11 #include "chrome/common/crash_keys.h"
  12 #include "chrome/service/cloud_print/print_system_win.h"
  13 #include "chrome/service/service_process.h"
  14 #include "chrome/service/service_utility_process_host.h"
  15 #include "grit/generated_resources.h"
  16 #include "printing/backend/win_helper.h"
  17 #include "printing/emf_win.h"
  18 #include "printing/page_range.h"
  19 #include "printing/printing_utils.h"
  20 #include "ui/base/l10n/l10n_util.h"
  21
  22 namespace cloud_print {
  23
  24 namespace {
  25
  26 class DevMode {
  27  public:
  28   DevMode() : dm_(NULL) {}
  29   ~DevMode() { Free(); }
  30
  31   void Allocate(int size) {
  32     Free();
  33     dm_ = reinterpret_cast<DEVMODE*>(new char[size]);
  34   }
  35
  36   void Free() {
  37     if (dm_)
  38       delete [] dm_;
  39     dm_ = NULL;
  40   }
  41
  42   DEVMODE* dm_;
  43
  44  private:
  45   DISALLOW_COPY_AND_ASSIGN(DevMode);
  46 };
  47
  48 HRESULT StreamFromPrintTicket(const std::string& print_ticket,
  49                               IStream** stream) {
  50   DCHECK(stream);
  51   HRESULT hr = CreateStreamOnHGlobal(NULL, TRUE, stream);
  52   if (FAILED(hr)) {
  53     return hr;
  54   }
  55   ULONG bytes_written = 0;
  56   (*stream)->Write(print_ticket.c_str(), print_ticket.length(), &bytes_written);
  57   DCHECK(bytes_written == print_ticket.length());
  58   LARGE_INTEGER pos = {0};
  59   ULARGE_INTEGER new_pos = {0};
  60   (*stream)->Seek(pos, STREAM_SEEK_SET, &new_pos);
  61   return S_OK;
  62 }
  63
  64 HRESULT PrintTicketToDevMode(const std::string& printer_name,
  65                              const std::string& print_ticket,
  66                              DevMode* dev_mode) {
  67   DCHECK(dev_mode);
  68   printing::ScopedXPSInitializer xps_initializer;
  69   if (!xps_initializer.initialized()) {
  70     // TODO(sanjeevr): Handle legacy proxy case (with no prntvpt.dll)
  71     return E_FAIL;
  72   }
  73
  74   base::win::ScopedComPtr<IStream> pt_stream;
  75   HRESULT hr = StreamFromPrintTicket(print_ticket, pt_stream.Receive());
  76   if (FAILED(hr))
  77     return hr;
  78
  79   HPTPROVIDER provider = NULL;
  80   hr = printing::XPSModule::OpenProvider(base::UTF8ToWide(printer_name), 1,
  81                                          &provider);
  82   if (SUCCEEDED(hr)) {
  83     ULONG size = 0;
  84     DEVMODE* dm = NULL;
  85     // Use kPTJobScope, because kPTDocumentScope breaks duplex.
  86     hr = printing::XPSModule::ConvertPrintTicketToDevMode(provider,
  87                                                           pt_stream,
  88                                                           kUserDefaultDevmode,
  89                                                           kPTJobScope,
  90                                                           &size,
  91                                                           &dm,
  92                                                           NULL);
  93     if (SUCCEEDED(hr)) {
  94       dev_mode->Allocate(size);
  95       memcpy(dev_mode->dm_, dm, size);
  96       printing::XPSModule::ReleaseMemory(dm);
  97     }
  98     printing::XPSModule::CloseProvider(provider);
  99   }
 100   return hr;
 101 }
 102
 103 class JobSpoolerWin : public PrintSystem::JobSpooler {
 104  public:
 105   JobSpoolerWin() : core_(new Core) {}
 106
 107   // PrintSystem::JobSpooler implementation.
 108   virtual bool Spool(const std::string& print_ticket,
 109                      const base::FilePath& print_data_file_path,
 110                      const std::string& print_data_mime_type,
 111                      const std::string& printer_name,
 112                      const std::string& job_title,
 113                      const std::vector<std::string>& tags,
 114                      JobSpooler::Delegate* delegate) OVERRIDE {
 115     // TODO(gene): add tags handling.
 116     scoped_refptr<printing::PrintBackend> print_backend(
 117         printing::PrintBackend::CreateInstance(NULL));
 118     crash_keys::ScopedPrinterInfo crash_key(
 119         print_backend->GetPrinterDriverInfo(printer_name));
 120     return core_->Spool(print_ticket, print_data_file_path,
 121                         print_data_mime_type, printer_name, job_title,
 122                         delegate);
 123   }
 124
 125  protected:
 126   virtual ~JobSpoolerWin() {}
 127
 128  private:
 129   // We use a Core class because we want a separate RefCountedThreadSafe
 130   // implementation for ServiceUtilityProcessHost::Client.
 131   class Core : public ServiceUtilityProcessHost::Client,
 132                public base::win::ObjectWatcher::Delegate {
 133    public:
 134     Core()
 135         : last_page_printed_(-1),
 136           job_id_(-1),
 137           delegate_(NULL),
 138           saved_dc_(0) {
 139     }
 140
 141     ~Core() {}
 142
 143     bool Spool(const std::string& print_ticket,
 144                const base::FilePath& print_data_file_path,
 145                const std::string& print_data_mime_type,
 146                const std::string& printer_name,
 147                const std::string& job_title,
 148                JobSpooler::Delegate* delegate) {
 149       scoped_refptr<printing::PrintBackend> print_backend(
 150           printing::PrintBackend::CreateInstance(NULL));
 151       crash_keys::ScopedPrinterInfo crash_key(
 152           print_backend->GetPrinterDriverInfo(printer_name));
 153       if (delegate_) {
 154         // We are already in the process of printing.
 155         NOTREACHED();
 156         return false;
 157       }
 158       last_page_printed_ = -1;
 159       // We only support PDF and XPS documents for now.
 160       if (print_data_mime_type == "application/pdf") {
 161         DevMode pt_dev_mode;
 162         HRESULT hr = PrintTicketToDevMode(printer_name, print_ticket,
 163                                           &pt_dev_mode);
 164         if (FAILED(hr)) {
 165           NOTREACHED();
 166           return false;
 167         }
 168
 169         HDC dc = CreateDC(L"WINSPOOL", base::UTF8ToWide(printer_name).c_str(),
 170                           NULL, pt_dev_mode.dm_);
 171         if (!dc) {
 172           NOTREACHED();
 173           return false;
 174         }
 175         hr = E_FAIL;
 176         DOCINFO di = {0};
 177         di.cbSize = sizeof(DOCINFO);
 178         base::string16 doc_name = base::UTF8ToUTF16(job_title);
 179         DCHECK(printing::SimplifyDocumentTitle(doc_name) == doc_name);
 180         di.lpszDocName = doc_name.c_str();
 181         job_id_ = StartDoc(dc, &di);
 182         if (job_id_ <= 0)
 183           return false;
 184
 185         printer_dc_.Set(dc);
 186         saved_dc_ = SaveDC(printer_dc_.Get());
 187         print_data_file_path_ = print_data_file_path;
 188         delegate_ = delegate;
 189         RenderNextPDFPages();
 190       } else if (print_data_mime_type == "application/vnd.ms-xpsdocument") {
 191         bool ret = PrintXPSDocument(printer_name,
 192                                     job_title,
 193                                     print_data_file_path,
 194                                     print_ticket);
 195         if (ret)
 196           delegate_ = delegate;
 197         return ret;
 198       } else {
 199         NOTREACHED();
 200         return false;
 201       }
 202       return true;
 203     }
 204
 205     void PreparePageDCForPrinting(HDC, double scale_factor) {
 206       SetGraphicsMode(printer_dc_.Get(), GM_ADVANCED);
 207       // Setup the matrix to translate and scale to the right place. Take in
 208       // account the scale factor.
 209       // Note that the printing output is relative to printable area of
 210       // the page. That is 0,0 is offset by PHYSICALOFFSETX/Y from the page.
 211       int offset_x = ::GetDeviceCaps(printer_dc_.Get(), PHYSICALOFFSETX);
 212       int offset_y = ::GetDeviceCaps(printer_dc_.Get(), PHYSICALOFFSETY);
 213       XFORM xform = {0};
 214       xform.eDx = static_cast<float>(-offset_x);
 215       xform.eDy = static_cast<float>(-offset_y);
 216       xform.eM11 = xform.eM22 = 1.0 / scale_factor;
 217       SetWorldTransform(printer_dc_.Get(), &xform);
 218     }
 219
 220     // ServiceUtilityProcessHost::Client implementation.
 221     virtual void OnRenderPDFPagesToMetafileSucceeded(
 222         const printing::Emf& metafile,
 223         int highest_rendered_page_number,
 224         double scale_factor) OVERRIDE {
 225       PreparePageDCForPrinting(printer_dc_.Get(), scale_factor);
 226       metafile.SafePlayback(printer_dc_.Get());
 227       bool done_printing = (highest_rendered_page_number !=
 228           last_page_printed_ + kPageCountPerBatch);
 229       last_page_printed_ = highest_rendered_page_number;
 230       if (done_printing)
 231         PrintJobDone();
 232       else
 233         RenderNextPDFPages();
 234     }
 235
 236     // base::win::ObjectWatcher::Delegate implementation.
 237     virtual void OnObjectSignaled(HANDLE object) OVERRIDE {
 238       DCHECK(xps_print_job_);
 239       DCHECK(object == job_progress_event_.Get());
 240       ResetEvent(job_progress_event_.Get());
 241       if (!delegate_)
 242         return;
 243       XPS_JOB_STATUS job_status = {0};
 244       xps_print_job_->GetJobStatus(&job_status);
 245       if ((job_status.completion == XPS_JOB_CANCELLED) ||
 246           (job_status.completion == XPS_JOB_FAILED)) {
 247         delegate_->OnJobSpoolFailed();
 248       } else if (job_status.jobId ||
 249                   (job_status.completion == XPS_JOB_COMPLETED)) {
 250         // Note: In the case of the XPS document being printed to the
 251         // Microsoft XPS Document Writer, it seems to skip spooling the job
 252         // and goes to the completed state without ever assigning a job id.
 253         delegate_->OnJobSpoolSucceeded(job_status.jobId);
 254       } else {
 255         job_progress_watcher_.StopWatching();
 256         job_progress_watcher_.StartWatching(job_progress_event_.Get(), this);
 257       }
 258     }
 259
 260     virtual void OnRenderPDFPagesToMetafileFailed() OVERRIDE {
 261       PrintJobDone();
 262     }
 263
 264     virtual void OnChildDied() OVERRIDE {
 265       PrintJobDone();
 266     }
 267
 268    private:
 269     // Helper class to allow PrintXPSDocument() to have multiple exits.
 270     class PrintJobCanceler {
 271      public:
 272       explicit PrintJobCanceler(
 273           base::win::ScopedComPtr<IXpsPrintJob>* job_ptr)
 274           : job_ptr_(job_ptr) {
 275       }
 276       ~PrintJobCanceler() {
 277         if (job_ptr_ && *job_ptr_) {
 278           (*job_ptr_)->Cancel();
 279           job_ptr_->Release();
 280         }
 281       }
 282
 283       void reset() { job_ptr_ = NULL; }
 284
 285      private:
 286       base::win::ScopedComPtr<IXpsPrintJob>* job_ptr_;
 287
 288       DISALLOW_COPY_AND_ASSIGN(PrintJobCanceler);
 289     };
 290
 291     void PrintJobDone() {
 292       // If there is no delegate, then there is nothing pending to process.
 293       if (!delegate_)
 294         return;
 295       RestoreDC(printer_dc_.Get(), saved_dc_);
 296       EndDoc(printer_dc_.Get());
 297       if (-1 == last_page_printed_) {
 298         delegate_->OnJobSpoolFailed();
 299       } else {
 300         delegate_->OnJobSpoolSucceeded(job_id_);
 301       }
 302       delegate_ = NULL;
 303     }
 304
 305     void RenderNextPDFPages() {
 306       printing::PageRange range;
 307       // Render 10 pages at a time.
 308       range.from = last_page_printed_ + 1;
 309       range.to = last_page_printed_ + kPageCountPerBatch;
 310       std::vector<printing::PageRange> page_ranges;
 311       page_ranges.push_back(range);
 312
 313       int printer_dpi = ::GetDeviceCaps(printer_dc_.Get(), LOGPIXELSX);
 314       int dc_width = GetDeviceCaps(printer_dc_.Get(), PHYSICALWIDTH);
 315       int dc_height = GetDeviceCaps(printer_dc_.Get(), PHYSICALHEIGHT);
 316       gfx::Rect render_area(0, 0, dc_width, dc_height);
 317       g_service_process->io_thread()->message_loop_proxy()->PostTask(
 318           FROM_HERE,
 319           base::Bind(&JobSpoolerWin::Core::RenderPDFPagesInSandbox, this,
 320                       print_data_file_path_, render_area, printer_dpi,
 321                       page_ranges, base::MessageLoopProxy::current()));
 322     }
 323
 324     // Called on the service process IO thread.
 325     void RenderPDFPagesInSandbox(
 326         const base::FilePath& pdf_path, const gfx::Rect& render_area,
 327         int render_dpi, const std::vector<printing::PageRange>& page_ranges,
 328         const scoped_refptr<base::MessageLoopProxy>&
 329             client_message_loop_proxy) {
 330       DCHECK(g_service_process->io_thread()->message_loop_proxy()->
 331           BelongsToCurrentThread());
 332       scoped_ptr<ServiceUtilityProcessHost> utility_host(
 333           new ServiceUtilityProcessHost(this, client_message_loop_proxy));
 334       // TODO(gene): For now we disabling autorotation for CloudPrinting.
 335       // Landscape/Portrait setting is passed in the print ticket and
 336       // server is generating portrait PDF always.
 337       // We should enable autorotation once server will be able to generate
 338       // PDF that matches paper size and orientation.
 339       if (utility_host->StartRenderPDFPagesToMetafile(
 340               pdf_path,
 341               printing::PdfRenderSettings(render_area, render_dpi, false),
 342               page_ranges)) {
 343         // The object will self-destruct when the child process dies.
 344         utility_host.release();
 345       }
 346     }
 347
 348     bool PrintXPSDocument(const std::string& printer_name,
 349                           const std::string& job_title,
 350                           const base::FilePath& print_data_file_path,
 351                           const std::string& print_ticket) {
 352       if (!printing::XPSPrintModule::Init())
 353         return false;
 354
 355       job_progress_event_.Set(CreateEvent(NULL, TRUE, FALSE, NULL));
 356       if (!job_progress_event_.Get())
 357         return false;
 358
 359       PrintJobCanceler job_canceler(&xps_print_job_);
 360       base::win::ScopedComPtr<IXpsPrintJobStream> doc_stream;
 361       base::win::ScopedComPtr<IXpsPrintJobStream> print_ticket_stream;
 362       if (FAILED(printing::XPSPrintModule::StartXpsPrintJob(
 363               base::UTF8ToWide(printer_name).c_str(),
 364               base::UTF8ToWide(job_title).c_str(),
 365               NULL, job_progress_event_.Get(), NULL, NULL, NULL,
 366               xps_print_job_.Receive(), doc_stream.Receive(),
 367               print_ticket_stream.Receive())))
 368         return false;
 369
 370       ULONG print_bytes_written = 0;
 371       if (FAILED(print_ticket_stream->Write(print_ticket.c_str(),
 372                                             print_ticket.length(),
 373                                             &print_bytes_written)))
 374         return false;
 375       DCHECK_EQ(print_ticket.length(), print_bytes_written);
 376       if (FAILED(print_ticket_stream->Close()))
 377         return false;
 378
 379       std::string document_data;
 380       base::ReadFileToString(print_data_file_path, &document_data);
 381       ULONG doc_bytes_written = 0;
 382       if (FAILED(doc_stream->Write(document_data.c_str(),
 383                                     document_data.length(),
 384                                     &doc_bytes_written)))
 385         return false;
 386       DCHECK_EQ(document_data.length(), doc_bytes_written);
 387       if (FAILED(doc_stream->Close()))
 388         return false;
 389
 390       job_progress_watcher_.StartWatching(job_progress_event_.Get(), this);
 391       job_canceler.reset();
 392       return true;
 393     }
 394
 395     // Some Cairo-generated PDFs from Chrome OS result in huge metafiles.
 396     // So the PageCountPerBatch is set to 1 for now.
 397     // TODO(sanjeevr): Figure out a smarter way to determine the pages per
 398     // batch. Filed a bug to track this at
 399     // http://code.google.com/p/chromium/issues/detail?id=57350.
 400     static const int kPageCountPerBatch = 1;
 401
 402     int last_page_printed_;
 403     PlatformJobId job_id_;
 404     PrintSystem::JobSpooler::Delegate* delegate_;
 405     int saved_dc_;
 406     base::win::ScopedCreateDC printer_dc_;
 407     base::FilePath print_data_file_path_;
 408     base::win::ScopedHandle job_progress_event_;
 409     base::win::ObjectWatcher job_progress_watcher_;
 410     base::win::ScopedComPtr<IXpsPrintJob> xps_print_job_;
 411
 412     DISALLOW_COPY_AND_ASSIGN(Core);
 413   };
 414   scoped_refptr<Core> core_;
 415
 416   DISALLOW_COPY_AND_ASSIGN(JobSpoolerWin);
 417 };
 418
 419 // A helper class to handle the response from the utility process to the
 420 // request to fetch printer capabilities and defaults.
 421 class PrinterCapsHandler : public ServiceUtilityProcessHost::Client {
 422  public:
 423   PrinterCapsHandler(
 424       const std::string& printer_name,
 425       const PrintSystem::PrinterCapsAndDefaultsCallback& callback)
 426           : printer_name_(printer_name), callback_(callback) {
 427   }
 428
 429   // ServiceUtilityProcessHost::Client implementation.
 430   virtual void OnChildDied() OVERRIDE {
 431     OnGetPrinterCapsAndDefaultsFailed(printer_name_);
 432   }
 433
 434   virtual void OnGetPrinterCapsAndDefaultsSucceeded(
 435       const std::string& printer_name,
 436       const printing::PrinterCapsAndDefaults& caps_and_defaults) OVERRIDE {
 437     callback_.Run(true, printer_name, caps_and_defaults);
 438     callback_.Reset();
 439     Release();
 440   }
 441
 442   virtual void OnGetPrinterCapsAndDefaultsFailed(
 443       const std::string& printer_name) OVERRIDE {
 444     printing::PrinterCapsAndDefaults caps_and_defaults;
 445     callback_.Run(false, printer_name, caps_and_defaults);
 446     callback_.Reset();
 447     Release();
 448   }
 449
 450   void Start() {
 451     g_service_process->io_thread()->message_loop_proxy()->PostTask(
 452         FROM_HERE,
 453         base::Bind(&PrinterCapsHandler::GetPrinterCapsAndDefaultsImpl, this,
 454                     base::MessageLoopProxy::current()));
 455   }
 456
 457  private:
 458     // Called on the service process IO thread.
 459   void GetPrinterCapsAndDefaultsImpl(
 460       const scoped_refptr<base::MessageLoopProxy>&
 461           client_message_loop_proxy) {
 462     DCHECK(g_service_process->io_thread()->message_loop_proxy()->
 463         BelongsToCurrentThread());
 464     scoped_ptr<ServiceUtilityProcessHost> utility_host(
 465         new ServiceUtilityProcessHost(this, client_message_loop_proxy));
 466     if (utility_host->StartGetPrinterCapsAndDefaults(printer_name_)) {
 467       // The object will self-destruct when the child process dies.
 468       utility_host.release();
 469     } else {
 470       client_message_loop_proxy->PostTask(
 471           FROM_HERE,
 472           base::Bind(&PrinterCapsHandler::OnGetPrinterCapsAndDefaultsFailed,
 473                       this, printer_name_));
 474     }
 475   }
 476
 477   std::string printer_name_;
 478   PrintSystem::PrinterCapsAndDefaultsCallback callback_;
 479 };
 480
 481 class PrintSystemWinXPS : public PrintSystemWin {
 482  public:
 483   PrintSystemWinXPS();
 484   virtual ~PrintSystemWinXPS();
 485
 486   // PrintSystem implementation.
 487   virtual PrintSystemResult Init() OVERRIDE;
 488   virtual void GetPrinterCapsAndDefaults(
 489       const std::string& printer_name,
 490       const PrinterCapsAndDefaultsCallback& callback) OVERRIDE;
 491   virtual bool PrintSystemWinXPS::ValidatePrintTicket(
 492       const std::string& printer_name,
 493       const std::string& print_ticket_data) OVERRIDE;
 494
 495   virtual PrintSystem::JobSpooler* CreateJobSpooler() OVERRIDE;
 496   virtual std::string GetSupportedMimeTypes() OVERRIDE;
 497
 498  private:
 499   DISALLOW_COPY_AND_ASSIGN(PrintSystemWinXPS);
 500 };
 501
 502 PrintSystemWinXPS::PrintSystemWinXPS() {
 503 }
 504
 505 PrintSystemWinXPS::~PrintSystemWinXPS() {
 506 }
 507
 508 PrintSystem::PrintSystemResult PrintSystemWinXPS::Init() {
 509   if (!printing::XPSModule::Init()) {
 510     std::string message = l10n_util::GetStringFUTF8(
 511         IDS_CLOUD_PRINT_XPS_UNAVAILABLE,
 512         l10n_util::GetStringUTF16(IDS_GOOGLE_CLOUD_PRINT));
 513     return PrintSystemResult(false, message);
 514   }
 515   return PrintSystemResult(true, std::string());
 516 }
 517
 518 void PrintSystemWinXPS::GetPrinterCapsAndDefaults(
 519     const std::string& printer_name,
 520     const PrinterCapsAndDefaultsCallback& callback) {
 521   // Launch as child process to retrieve the capabilities and defaults because
 522   // this involves invoking a printer driver DLL and crashes have been known to
 523   // occur.
 524   PrinterCapsHandler* handler =
 525       new PrinterCapsHandler(printer_name, callback);
 526   handler->AddRef();
 527   handler->Start();
 528 }
 529
 530 bool PrintSystemWinXPS::ValidatePrintTicket(
 531     const std::string& printer_name,
 532     const std::string& print_ticket_data) {
 533   crash_keys::ScopedPrinterInfo crash_key(GetPrinterDriverInfo(printer_name));
 534   printing::ScopedXPSInitializer xps_initializer;
 535   if (!xps_initializer.initialized()) {
 536     // TODO(sanjeevr): Handle legacy proxy case (with no prntvpt.dll)
 537     return false;
 538   }
 539   bool ret = false;
 540   HPTPROVIDER provider = NULL;
 541   printing::XPSModule::OpenProvider(base::UTF8ToWide(printer_name.c_str()),
 542                                     1,
 543                                     &provider);
 544   if (provider) {
 545     base::win::ScopedComPtr<IStream> print_ticket_stream;
 546     CreateStreamOnHGlobal(NULL, TRUE, print_ticket_stream.Receive());
 547     ULONG bytes_written = 0;
 548     print_ticket_stream->Write(print_ticket_data.c_str(),
 549                                print_ticket_data.length(),
 550                                &bytes_written);
 551     DCHECK(bytes_written == print_ticket_data.length());
 552     LARGE_INTEGER pos = {0};
 553     ULARGE_INTEGER new_pos = {0};
 554     print_ticket_stream->Seek(pos, STREAM_SEEK_SET, &new_pos);
 555     base::win::ScopedBstr error;
 556     base::win::ScopedComPtr<IStream> result_ticket_stream;
 557     CreateStreamOnHGlobal(NULL, TRUE, result_ticket_stream.Receive());
 558     ret = SUCCEEDED(printing::XPSModule::MergeAndValidatePrintTicket(
 559         provider,
 560         print_ticket_stream.get(),
 561         NULL,
 562         kPTJobScope,
 563         result_ticket_stream.get(),
 564         error.Receive()));
 565     printing::XPSModule::CloseProvider(provider);
 566   }
 567   return ret;
 568 }
 569
 570 PrintSystem::JobSpooler* PrintSystemWinXPS::CreateJobSpooler() {
 571   return new JobSpoolerWin();
 572 }
 573
 574 std::string PrintSystemWinXPS::GetSupportedMimeTypes() {
 575   if (printing::XPSPrintModule::Init())
 576     return "application/vnd.ms-xpsdocument,application/pdf";
 577   return "application/pdf";
 578 }
 579
 580 }  // namespace
 581
 582 scoped_refptr<PrintSystem> PrintSystem::CreateInstance(
 583     const base::DictionaryValue* print_system_settings) {
 584   return new PrintSystemWinXPS;
 585 }
 586
 587 }  // namespace cloud_print