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

content/renderer/input/input_event_filter.cc

Index: content/renderer/input/input_event_filter.cc
diff --git a/content/renderer/input/input_event_filter.cc b/content/renderer/input/input_event_filter.cc
index e62ee2cf941c784c96db901db93940ae26ccb648..4b3c82247b8b8cd8448c741e99f115b6c27b6106 100644
--- a/content/renderer/input/input_event_filter.cc
+++ b/content/renderer/input/input_event_filter.cc
@@ -50,7 +50,8 @@ InputEventFilter::InputEventFilter(
       main_listener_(main_listener),
       sender_(NULL),
       target_task_runner_(target_task_runner),
-      current_overscroll_params_(NULL) {
+      current_overscroll_params_(NULL),
+      is_flinging_(false) {
   DCHECK(target_task_runner_.get());
 }
 
@@ -184,7 +185,7 @@ void InputEventFilter::ForwardToHandler(const IPC::Message& message) {
     RouteQueueMap::iterator iter = route_queues_.find(routing_id);
     if (iter != route_queues_.end())
       send_ack &= iter->second->HandleEvent(event, latency_info, dispatch_type,
-                                            ack_state);
+                                            ack_state, is_flinging_);
   }
 
   if (!send_ack)
@@ -228,4 +229,8 @@ void InputEventFilter::SendEventToMainThread(
   main_task_runner_->PostTask(FROM_HERE, base::Bind(main_listener_, new_msg));
 }
 
+void InputEventFilter::SetIsFlinging(bool is_flinging) {
+  is_flinging_ = is_flinging;
+}
+
 }  // namespace content