Add UMA metric for tracking listeners for blocking touch while fling is happening

content/renderer/input/input_handler_manager.h

 // Copyright 2013 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_RENDERER_INPUT_INPUT_HANDLER_MANAGER_H_
 #define CONTENT_RENDERER_INPUT_INPUT_HANDLER_MANAGER_H_
 
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 67 matching lines @@
   // Called from the compositor's thread.
   virtual InputEventAckState HandleInputEvent(
       int routing_id,
       const blink::WebInputEvent* input_event,
       ui::LatencyInfo* latency_info);
 
   // Called from the compositor's thread.
   void DidOverscroll(int routing_id, const DidOverscrollParams& params);
 
   // Called from the compositor's thread.
+  void DidStartFlinging(int routing_id);
   void DidStopFlinging(int routing_id);
 
   // Called from the compositor's thread.
   void DidAnimateForInput();
 
  private:
   // Called from the compositor's thread.
   void AddInputHandlerOnCompositorThread(
       int routing_id,
       const scoped_refptr<base::SingleThreadTaskRunner>& main_task_runner,
@@ skipping 23 matching lines @@
   const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   InputHandlerManagerClient* const client_;
   // May be null.
   SynchronousInputHandlerProxyClient* const synchronous_handler_proxy_client_;
   scheduler::RendererScheduler* const renderer_scheduler_;  // Not owned.
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_INPUT_INPUT_HANDLER_MANAGER_H_