Introduce PlatformBitmap, which is a minimal helper class that wraps an SkBitmap

content/browser/renderer_host/render_widget_host_view_android.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_WIDGET_HOST_VIEW_ANDROID_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_
 
 #include "base/compiler_specific.h"
 #include "base/i18n/rtl.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 76 matching lines @@
   virtual void AcceleratedSurfacePostSubBuffer(
       const GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params& params,
       int gpu_host_id) OVERRIDE;
   virtual void AcceleratedSurfaceSuspend() OVERRIDE;
   virtual bool HasAcceleratedSurface(const gfx::Size& desired_size) OVERRIDE;
   virtual void SetBackground(const SkBitmap& background) OVERRIDE;
   virtual void CopyFromCompositingSurface(
       const gfx::Rect& src_subrect,
       const gfx::Size& dst_size,
       const base::Callback<void(bool)>& callback,
-      skia::PlatformCanvas* output) OVERRIDE;
+      skia::PlatformBitmap* output) OVERRIDE;
   virtual BackingStore* AllocBackingStore(const gfx::Size& size) OVERRIDE;
   virtual gfx::GLSurfaceHandle GetCompositingSurface() OVERRIDE;
   virtual void GetScreenInfo(WebKit::WebScreenInfo* results) OVERRIDE;
   virtual gfx::Rect GetBoundsInRootWindow() OVERRIDE;
   virtual void UnhandledWheelEvent(
       const WebKit::WebMouseWheelEvent& event) OVERRIDE;
   virtual void ProcessTouchAck(WebKit::WebInputEvent::Type type,
                                bool processed) OVERRIDE;
   virtual void SetHasHorizontalScrollbar(
       bool has_horizontal_scrollbar) OVERRIDE;
@@ skipping 49 matching lines @@
   // The handle for the transport surface (between renderer and browser-side
   // compositor) for this view.
   gfx::GLSurfaceHandle shared_surface_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAndroid);
 };
 
 } // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_