Fix a crash when saving a <canvas> or <img> image which is large.

content/browser/renderer_host/render_message_filter.h

 // 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_MESSAGE_FILTER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_MESSAGE_FILTER_H_
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
@@ skipping 168 matching lines @@
       int plugin_child_id,
       int32 pp_instance,
       PepperRendererInstanceData instance_data,
       bool is_external);
   void OnDidDeleteOutOfProcessPepperInstance(int plugin_child_id,
                                              int32 pp_instance,
                                              bool is_external);
   void OnOpenChannelToPpapiBroker(int routing_id,
                                   const base::FilePath& path);
   void OnGenerateRoutingID(int* route_id);
+  void DownloadUrl(int render_view_id,
+                   const GURL& url,
+                   const Referrer& referrer,
+                   const base::string16& suggested_name,
+                   const bool use_prompt = false);

[Ken Russell (switch to Gerrit), 2014/09/04 00:23:26]

Default arguments are not allowed per the style guide.
http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml#Default_Arguments
. Please just pass use_prompt explicitly.

[zino, 2014/09/05 03:47:47]

Done.

   void OnDownloadUrl(int render_view_id,
                      const GURL& url,
                      const Referrer& referrer,
-                     const base::string16& suggested_name,
-                     const bool use_prompt);
+                     const base::string16& suggested_name);
+  void OnSaveImageFromDataURL(int render_view_id, const std::string& url);
   void OnCheckNotificationPermission(const GURL& source_origin,
                                      int* permission_level);
 
   void OnGetCPUUsage(int* cpu_usage);
 
   void OnGetAudioHardwareConfig(media::AudioParameters* input_params,
                                 media::AudioParameters* output_params);
 
 #if defined(OS_WIN)
   // Used to look up the monitor color profile.
@@ skipping 109 matching lines @@
 
   media::AudioManager* audio_manager_;
   MediaInternals* media_internals_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderMessageFilter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_MESSAGE_FILTER_H_