Fix PDF Viewer control loading at HiDPI scale factors

chrome/renderer/pepper/ppb_pdf_impl.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/pepper/ppb_pdf_impl.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/utf_string_conversions.h"
 #include "build/build_config.h"
@@ skipping 331 matching lines @@
   gfx::ImageSkia* res_image_skia =
       ResourceBundle::GetSharedInstance().GetImageSkiaNamed(res_id);
 
   if (!res_image_skia)
     return 0;
 
   // Validate the instance.
   if (!content::GetHostGlobals()->GetInstance(instance_id))
     return 0;
 
-  if (!res_image_skia->HasRepresentation(scale_factor))
-    return 0;
-
   gfx::ImageSkiaRep image_skia_rep = res_image_skia->GetRepresentation(
       scale_factor);
 
+  if (image_skia_rep.is_null() || image_skia_rep.scale_factor() != scale_factor)
+    return 0;
+
   scoped_refptr<webkit::ppapi::PPB_ImageData_Impl> image_data(
       new webkit::ppapi::PPB_ImageData_Impl(
           instance_id,
           webkit::ppapi::PPB_ImageData_Impl::PLATFORM));
   if (!image_data->Init(
           webkit::ppapi::PPB_ImageData_Impl::GetNativeImageDataFormat(),
           image_skia_rep.pixel_width(),
           image_skia_rep.pixel_height(),
           false)) {
     return 0;
@@ skipping 50 matching lines @@
 
   WebKit::WebElement element = instance->container()->element();
   WebKit::WebView* view = element.document().frame()->view();
   content::RenderView* render_view = content::RenderView::FromWebView(view);
 
   PrintWebViewHelper* print_view_helper = PrintWebViewHelper::Get(render_view);
   if (print_view_helper)
     print_view_helper->PrintNode(element);
 #endif
 }