Add telemetry to track the time an event spent waiting for the main thread.

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..6e90479687308281bf41f900716daa46bec80dba 100644
--- a/content/browser/renderer_host/input/input_router_client.h
+++ b/content/browser/renderer_host/input/input_router_client.h
@@ -68,7 +68,7 @@ class CONTENT_EXPORT InputRouterClient {
                                InputEventAckState ack_result) = 0;
   virtual void OnTouchEventAck(const TouchEventWithLatencyInfo& event,
                                InputEventAckState ack_result) = 0;
-  virtual void OnGestureEventAck(const WebKit::WebGestureEvent& event,
+  virtual void OnGestureEventAck(const GestureEventWithLatencyInfo& event,
                                  InputEventAckState ack_result) = 0;
   virtual void OnUnexpectedEventAck(bool bad_message) = 0;
 };