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

content/public/browser/render_widget_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_PUBLIC_BROWSER_RENDER_WIDGET_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_RENDER_WIDGET_HOST_H_
 
 #include "base/callback.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/keyboard_listener.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "ipc/ipc_channel.h"
 #include "ipc/ipc_sender.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebTextDirection.h"
 #include "ui/gfx/size.h"
 #include "ui/surface/transport_dib.h"
 
 #if defined(TOOLKIT_GTK)
 #include "ui/base/x/x11_util.h"
 #elif defined(OS_MACOSX)
 #include "skia/ext/platform_device.h"
 #endif
 
 namespace gfx {
 class Rect;
 }
 
 namespace skia {
-class PlatformCanvas;
+class PlatformBitmap;
 }
 
 namespace content {
 
 class RenderProcessHost;
 class RenderWidgetHostImpl;
 class RenderWidgetHostView;
 
 // A RenderWidgetHost manages the browser side of a browser<->renderer
 // HWND connection.  The HWND lives in the browser process, and
@@ skipping 130 matching lines @@
   // contens size, the content is not resized. If |accelerated_dest_size| is
   // empty, the size copied from the source contents is used.
   // |callback| is invoked with true on success, false otherwise. |output| can
   // be initialized even on failure.
   // NOTE: |callback| is called synchronously if the backing store is available.
   // When accelerated compositing is active, it is called asynchronously on Aura
   // and synchronously on the other platforms.
   virtual void CopyFromBackingStore(const gfx::Rect& src_rect,
                                     const gfx::Size& accelerated_dest_size,
                                     const base::Callback<void(bool)>& callback,
-                                    skia::PlatformCanvas* output) = 0;
+                                    skia::PlatformBitmap* output) = 0;
 #if defined(TOOLKIT_GTK)
   // Paint the backing store into the target's |dest_rect|.
   virtual bool CopyFromBackingStoreToGtkWindow(const gfx::Rect& dest_rect,
                                                GdkWindow* target) = 0;
 #elif defined(OS_MACOSX)
   virtual gfx::Size GetBackingStoreSize() = 0;
   virtual bool CopyFromBackingStoreToCGContext(const CGRect& dest_rect,
                                                CGContextRef target) = 0;
 #endif
 
@@ skipping 84 matching lines @@
   // within content/.  This method is necessary because
   // RenderWidgetHost is the root of a diamond inheritance pattern, so
   // subclasses inherit it virtually, which removes our ability to
   // static_cast to the subclass.
   virtual RenderWidgetHostImpl* AsRenderWidgetHostImpl() = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_RENDER_WIDGET_HOST_H_