Add basic support to dump pixel results

content/shell/layout_test_controller_host.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_SHELL_LAYOUT_TEST_CONTROLLER_HOST_H_
 #define CONTENT_SHELL_LAYOUT_TEST_CONTROLLER_HOST_H_
 #pragma once
 
 #include <map>
 #include <string>
 
 #include "content/public/browser/render_view_host_observer.h"
 
+class SkBitmap;
+
 namespace content {
 
 class LayoutTestControllerHost : public RenderViewHostObserver {
  public:
   static LayoutTestControllerHost* FromRenderViewHost(
       RenderViewHost* render_view_host);
 
+  // Initialize the LayoutTestControllerHost for a given test.
+  static void Init(const std::string& expected_pixel_hash);
+
   explicit LayoutTestControllerHost(RenderViewHost* render_view_host);
   virtual ~LayoutTestControllerHost();
 
   bool should_stay_on_page_after_handling_before_unload() const {
     return should_stay_on_page_after_handling_before_unload_;
   }
 
   // RenderViewHostObserver implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
  private:
   void CaptureDump();
 
   // Message handlers.
   void OnDidFinishLoad();
   void OnTextDump(const std::string& dump);
+  void OnImageDump(const SkBitmap& image);
 
   // layoutTestController handlers.
   void OnNotifyDone();
   void OnDumpAsText();
   void OnDumpChildFramesAsText();
   void OnSetPrinting();
   void OnSetShouldStayOnPageAfterHandlingBeforeUnload(bool should_stay_on_page);
   void OnWaitUntilDone();
 
   static std::map<RenderViewHost*, LayoutTestControllerHost*> controllers_;
+  static std::string expected_pixel_hash_;
 
   bool dump_as_text_;
   bool dump_child_frames_;
   bool is_printing_;
   bool should_stay_on_page_after_handling_before_unload_;
   bool wait_until_done_;
 
   DISALLOW_COPY_AND_ASSIGN(LayoutTestControllerHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_LAYOUT_TEST_CONTROLLER_HOST_H_