Provided batched input delivery with a BufferedInputRouter

content/browser/renderer_host/render_widget_host_impl.h

Index: content/browser/renderer_host/render_widget_host_impl.h
diff --git a/content/browser/renderer_host/render_widget_host_impl.h b/content/browser/renderer_host/render_widget_host_impl.h
index 362c6d7f793f0b0405da6e7651f897d54e3217b2..ef7cd98eed2464c88d6154c4444fda2bd2a22aa4 100644
--- a/content/browser/renderer_host/render_widget_host_impl.h
+++ b/content/browser/renderer_host/render_widget_host_impl.h
@@ -23,6 +23,7 @@
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "build/build_config.h"
+#include "content/browser/renderer_host/input/input_ack_handler.h"
 #include "content/browser/renderer_host/input/input_router_client.h"
 #include "content/browser/renderer_host/smooth_scroll_gesture_controller.h"
 #include "content/common/browser_rendering_stats.h"
@@ -85,6 +86,7 @@ struct EditCommand;
 // embedders of content, and adds things only visible to content.
 class CONTENT_EXPORT RenderWidgetHostImpl : virtual public RenderWidgetHost,
                                             public InputRouterClient,
+                                            public InputAckHandler,
                                             public IPC::Listener {
  public:
   // routing_id can be MSG_ROUTING_NONE, in which case the next available
@@ -729,6 +731,10 @@ class CONTENT_EXPORT RenderWidgetHostImpl : virtual public RenderWidgetHost,
       const TouchEventWithLatencyInfo& touch_event) OVERRIDE;
   virtual bool OnSendGestureEventImmediately(
       const GestureEventWithLatencyInfo& gesture_event) OVERRIDE;
+  virtual void SetNeedsFlush() OVERRIDE;
+  virtual void DidFlush() OVERRIDE;
+
+  // InputAckHandler
   virtual void OnKeyboardEventAck(const NativeWebKeyboardEvent& event,
                                   InputEventAckState ack_result) OVERRIDE;
   virtual void OnWheelEventAck(const WebKit::WebMouseWheelEvent& event,