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

content/renderer/input/input_handler_manager.cc

 // 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.
 
 #include "content/renderer/input/input_handler_manager.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/location.h"
@@ skipping 227 matching lines @@
       break;
   }
   return input_event_ack_state;
 }
 
 void InputHandlerManager::DidOverscroll(int routing_id,
                                         const DidOverscrollParams& params) {
   client_->DidOverscroll(routing_id, params);
 }
 
+void InputHandlerManager::DidStartFlinging(int routing_id) {
+  client_->DidStartFlinging(routing_id);
+}
+
 void InputHandlerManager::DidStopFlinging(int routing_id) {
   client_->DidStopFlinging(routing_id);
 }
 
 void InputHandlerManager::DidAnimateForInput() {
   renderer_scheduler_->DidAnimateForInputOnCompositorThread();
 }
 
 }  // namespace content