cc: Introduce BeginFrame sequence numbers and acknowledgements.

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 <stddef.h>
 #include <stdint.h>
 
@@ skipping 45 matching lines @@
 namespace base {
 class RefCountedBytes;
 }
 
 namespace blink {
 class WebInputEvent;
 class WebMouseEvent;
 struct WebCompositionUnderline;
 }
 
+namespace cc {
+struct BeginFrameAck;
+}
+
 #if defined(OS_MACOSX)
 namespace device {
 class PowerSaveBlocker;
 }  // namespace device
 #endif
 
 namespace gfx {
 class Range;
 }
 
@@ skipping 541 matching lines @@
   void RendererIsResponsive();
 
   // IPC message handlers
   void OnRenderProcessGone(int status, int error_code);
   void OnClose();
   void OnUpdateScreenRectsAck();
   void OnRequestMove(const gfx::Rect& pos);
   void OnSetTooltipText(const base::string16& tooltip_text,
                         blink::WebTextDirection text_direction_hint);
   bool OnSwapCompositorFrame(const IPC::Message& message);
+  void OnBeginFrameDidNotDraw(const cc::BeginFrameAck& ack);
   void OnUpdateRect(const ViewHostMsg_UpdateRect_Params& params);
   void OnQueueSyntheticGesture(const SyntheticGesturePacket& gesture_packet);
   void OnSetCursor(const WebCursor& cursor);
   void OnTextInputStateChanged(const TextInputState& params);
 
   void OnImeCompositionRangeChanged(
       const gfx::Range& range,
       const std::vector<gfx::Rect>& character_bounds);
   void OnImeCancelComposition();
   void OnLockMouse(bool user_gesture,
@@ skipping 269 matching lines @@
 #endif
 
   base::WeakPtrFactory<RenderWidgetHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_