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

chrome/browser/extensions/api/tabs/tabs.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 CHROME_BROWSER_EXTENSIONS_API_TABS_TABS_H__
 #define CHROME_BROWSER_EXTENSIONS_API_TABS_TABS_H__
 
 #include <string>
 #include <vector>
 
@@ skipping 11 matching lines @@
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace content {
 class WebContents;
 }
 
 namespace skia {
-class PlatformCanvas;
+class PlatformBitmap;
 }
 
 // Windows
 class GetWindowFunction : public SyncExtensionFunction {
   virtual ~GetWindowFunction() {}
   virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("windows.get")
 };
 class GetCurrentWindowFunction : public SyncExtensionFunction {
   virtual ~GetCurrentWindowFunction() {}
@@ skipping 142 matching lines @@
 
   virtual ~CaptureVisibleTabFunction() {}
   virtual bool RunImpl() OVERRIDE;
   virtual bool GetTabToCapture(content::WebContents** web_contents);
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
   void SendResultFromBitmap(const SkBitmap& screen_capture);
 
  private:
-  void CopyFromBackingStoreComplete(skia::PlatformCanvas* canvas,
+  void CopyFromBackingStoreComplete(skia::PlatformBitmap* bitmap,
                                     bool succeeded);
 
   content::NotificationRegistrar registrar_;
 
   // The format (JPEG vs PNG) of the resulting image.  Set in RunImpl().
   ImageFormat image_format_;
 
   // Quality setting to use when encoding jpegs.  Set in RunImpl().
   int image_quality_;
 
   DECLARE_EXTENSION_FUNCTION_NAME("tabs.captureVisibleTab")
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_TABS_TABS_H__