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

content/renderer/input/input_handler_manager.cc

Index: content/renderer/input/input_handler_manager.cc
diff --git a/content/renderer/input/input_handler_manager.cc b/content/renderer/input/input_handler_manager.cc
index 74e8a4ae4c5e92291dfabe61b0959e5e0c1253c5..c1ead85bc4197316ae68afc538e29324bb6651bb 100644
--- a/content/renderer/input/input_handler_manager.cc
+++ b/content/renderer/input/input_handler_manager.cc
@@ -221,6 +221,10 @@ InputEventAckState InputHandlerManager::HandleInputEvent(
   TRACE_EVENT1("input", "InputHandlerManager::HandleInputEvent",
                "result", "EventSentToInputHandlerProxy");
   InputHandlerProxy* proxy = it->second->input_handler_proxy();
+  if (blink::WebInputEvent::isTouchEventType(input_event->type)) {

[dtapuska, 2016/05/05 20:22:21]

this seems odd to repeatedly set a state on touch events. Shouldn't the state
always be consistent irrespective of the input type that is processed?

Shouldn't the state just be replicated to the associated client all the time?

+    client_->SetIsFlinging(proxy->isFlinging());
+  }
+
   InputEventAckState input_event_ack_state = InputEventDispositionToAck(
       proxy->HandleInputEventWithLatencyInfo(*input_event, latency_info));
   switch (input_event_ack_state) {