Provided batched input delivery with a BufferedInputRouter

content/browser/renderer_host/input/input_router_client.h

Index: content/browser/renderer_host/input/input_router_client.h
diff --git a/content/browser/renderer_host/input/input_router_client.h b/content/browser/renderer_host/input/input_router_client.h
index 9c854224b5202f5bd223699fbef03f6836fab6bc..6b23df0ae6ed54751126e3ee941d4b532adbd965 100644
--- a/content/browser/renderer_host/input/input_router_client.h
+++ b/content/browser/renderer_host/input/input_router_client.h
@@ -71,6 +71,16 @@ class CONTENT_EXPORT InputRouterClient {
   virtual void OnGestureEventAck(const WebKit::WebGestureEvent& event,
                                  InputEventAckState ack_result) = 0;
   virtual void OnUnexpectedEventAck(bool bad_message) = 0;
+
+  // Certain router implementations require periodic flushing of queued events.
+  // When this method is called, the client should ensure a timely call, either
+  // synchronous or asynchronous, of |Flush| on the InputRouter.
+  virtual void SetNeedsFlush() = 0;
+
+  // Called when the router has finished flushing all events queued at the time
+  // of the call to Flush.  The call will typically be asynchronous with
+  // respect to the call to |Flush| on the InputRouter.
+  virtual void DidFlush() = 0;
 };
 
 } // namespace content