[wip] Add some more state to RenderViewHost's lifetime.

content/browser/renderer_host/render_view_host_impl.h

Index: content/browser/renderer_host/render_view_host_impl.h
diff --git a/content/browser/renderer_host/render_view_host_impl.h b/content/browser/renderer_host/render_view_host_impl.h
index 9fdbd0af2b2ccae1a58c8c84048cd28e443b9313..09c7bcf2e82e83ff1e4ffbe7262d82ce9d6f2753 100644
--- a/content/browser/renderer_host/render_view_host_impl.h
+++ b/content/browser/renderer_host/render_view_host_impl.h
@@ -239,6 +239,15 @@ class CONTENT_EXPORT RenderViewHostImpl
   virtual void NotifyTimezoneChange() OVERRIDE;
   virtual void GetAudioOutputControllers(
       const GetAudioOutputControllersCallback& callback) const OVERRIDE;
+  virtual void CopyFromBackingStore(
+      const gfx::Rect& src_rect,
+      const gfx::Size& accelerated_dst_size,
+      const base::Callback<void(bool, const SkBitmap&)>& callback) OVERRIDE;
+
+  void CopyFromBackingStoreCallback(
+      const base::Callback<void(bool, const SkBitmap&)>& callback,
+      bool success,
+      const SkBitmap& bitmap);
 
 #if defined(OS_ANDROID)
   virtual void ActivateNearestFindResult(int request_id,
@@ -751,6 +760,8 @@ class CONTENT_EXPORT RenderViewHostImpl
   // TODO(nasko): Move to RenderFrameHost, as this is per-frame state.
   base::Closure pending_shutdown_on_swap_out_;
 
+  int copy_requests_;
+
   base::WeakPtrFactory<RenderViewHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewHostImpl);