Get semantic capabilities from Print Backend.

chrome/renderer/print_web_view_helper.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/print_web_view_helper.h"
 
 #include <string>
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
@@ skipping 941 matching lines @@
   // PDF printer device supports alpha blending.
   print_pages_params_->params.supports_alpha_blend = true;
 
   bool generate_draft_pages = false;
   if (!settings.GetBoolean(printing::kSettingGenerateDraftData,
                            &generate_draft_pages)) {
     NOTREACHED();
   }
   print_preview_context_.set_generate_draft_pages(generate_draft_pages);
 
+  VLOG(1) << "Creating preview document";

[Albert Bodenhamer, 2012/08/29 23:54:26]

Temp debug code I assume?

[gene, 2012/08/30 03:19:03]

yeah :), I'll remove it

   if (CreatePreviewDocument()) {
+    VLOG(1) << "Finished creating preview document OK";
     DidFinishPrinting(OK);
   } else {
     if (notify_browser_of_print_failure_)
       LOG(ERROR) << "CreatePreviewDocument failed";
     DidFinishPrinting(FAIL_PREVIEW);
   }
 }
 
 bool PrintWebViewHelper::CreatePreviewDocument() {
   PrintMsg_Print_Params print_params = print_pages_params_->params;
   const std::vector<int>& pages = print_pages_params_->pages;
+  VLOG(1) << "before print_preview_context_.CreatePreviewDocument";
   if (!print_preview_context_.CreatePreviewDocument(&print_params, pages,
                                                     ignore_css_margins_)) {
+    VLOG(1) << "print_preview_context_.CreatePreviewDocument failed";
     return false;
   }
+  VLOG(1) << "print_preview_context_.CreatePreviewDocument succeeded";
 
   PageSizeMargins default_page_layout;
   ComputePageLayoutInPointsForCss(print_preview_context_.frame(), 0,
                                   print_params, ignore_css_margins_, NULL,
                                   &default_page_layout);
 
   if (!old_print_pages_params_.get() ||
       !PageLayoutIsEqual(*old_print_pages_params_, *print_pages_params_)) {
     bool has_page_size_style = PrintingFrameHasPageSizeStyle(
         print_preview_context_.frame(),
@@ skipping 892 matching lines @@
   DCHECK(IsRendering());
   return prep_frame_view_->GetPrintCanvasSize();
 }
 
 void PrintWebViewHelper::PrintPreviewContext::ClearContext() {
   prep_frame_view_.reset();
   metafile_.reset();
   pages_to_render_.clear();
   error_ = PREVIEW_ERROR_NONE;
 }