Support error handling for Surface readbacks

content/browser/renderer_host/render_widget_host_impl.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_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 
 #include <deque>
 #include <list>
 #include <map>
@@ skipping 115 matching lines @@
 
   // RenderWidgetHost implementation.
   virtual void UpdateTextDirection(blink::WebTextDirection direction) OVERRIDE;
   virtual void NotifyTextDirection() OVERRIDE;
   virtual void Focus() OVERRIDE;
   virtual void Blur() OVERRIDE;
   virtual void SetActive(bool active) OVERRIDE;
   virtual void CopyFromBackingStore(
       const gfx::Rect& src_rect,
       const gfx::Size& accelerated_dst_size,
-      const base::Callback<void(bool, const SkBitmap&)>& callback,
+      const base::Callback<void(bool, const SkBitmap&, const int&)>& callback,
       const SkColorType color_type) OVERRIDE;
   virtual bool CanCopyFromBackingStore() OVERRIDE;
 #if defined(OS_ANDROID)
   virtual void LockBackingStore() OVERRIDE;
   virtual void UnlockBackingStore() OVERRIDE;
 #endif
   virtual void ForwardMouseEvent(
       const blink::WebMouseEvent& mouse_event) OVERRIDE;
   virtual void ForwardWheelEvent(
       const blink::WebMouseWheelEvent& wheel_event) OVERRIDE;
@@ skipping 701 matching lines @@
   typedef std::map<int,
       base::Callback<void(const unsigned char*, size_t)> > PendingSnapshotMap;
   PendingSnapshotMap pending_browser_snapshots_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_