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

content/browser/renderer_host/backing_store.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_BACKING_STORE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_BACKING_STORE_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/callback_forward.h"
 #include "content/common/content_export.h"
 #include "ui/gfx/size.h"
 #include "ui/surface/transport_dib.h"
 
 class RenderProcessHost;
 
 namespace gfx {
 class Rect;
 }
 
 namespace skia {
-class PlatformCanvas;
+class PlatformBitmap;
 }
 
 namespace content {
 class RenderProcessHost;
 class RenderWidgetHost;
 
 // Represents a backing store for the pixels in a RenderWidgetHost.
 class CONTENT_EXPORT BackingStore {
  public:
   virtual ~BackingStore();
@@ skipping 25 matching lines @@
       const std::vector<gfx::Rect>& copy_rects,
       float scale_factor,
       const base::Closure& completion_callback,
       bool* scheduled_completion_callback) = 0;
 
   // Extracts the gives subset of the backing store and copies it to the given
   // PlatformCanvas. The PlatformCanvas should not be initialized. This function
   // will call initialize() with the correct size. The return value indicates
   // success.
   virtual bool CopyFromBackingStore(const gfx::Rect& rect,
-                                    skia::PlatformCanvas* output) = 0;
+                                    skia::PlatformBitmap* output) = 0;
 
   // Scrolls the contents of clip_rect in the backing store by dx or dy (but dx
   // and dy cannot both be non-zero).
   virtual void ScrollBackingStore(int dx, int dy,
                                   const gfx::Rect& clip_rect,
                                   const gfx::Size& view_size) = 0;
  protected:
   // Can only be constructed via subclasses.
   BackingStore(RenderWidgetHost* widget, const gfx::Size& size);
 
  private:
   // The owner of this backing store.
   RenderWidgetHost* render_widget_host_;
 
   // The size of the backing store.
   gfx::Size size_;
 
   DISALLOW_COPY_AND_ASSIGN(BackingStore);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_BACKING_STORE_H_