Don't restart the hang renderer timeout on messages ack'd from the compositor thread.

content/browser/renderer_host/input/input_router_impl_perftest.cc

 // Copyright 2014 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 <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 67 matching lines @@
   ~NullInputRouterClient() override {}
 
   // InputRouterClient
   InputEventAckState FilterInputEvent(
       const blink::WebInputEvent& input_event,
       const ui::LatencyInfo& latency_info) override {
     return INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
   }
   void IncrementInFlightEventCount(
       blink::WebInputEvent::Type event_type) override {}
-  void DecrementInFlightEventCount() override {}
+  void DecrementInFlightEventCount(InputEventAckSource ack_source) override {}
   void OnHasTouchEventHandlers(bool has_handlers) override {}
   void DidFlush() override {}
   void DidOverscroll(const ui::DidOverscrollParams& params) override {}
   void DidStopFlinging() override {}
   void ForwardGestureEventWithLatencyInfo(
       const blink::WebGestureEvent& event,
       const ui::LatencyInfo& latency_info) override {}
 };
 
 class NullIPCSender : public IPC::Sender {
@@ skipping 141 matching lines @@
   }
 
   void SendEvent(const WebTouchEvent& touch, const ui::LatencyInfo& latency) {
     input_router_->SendTouchEvent(TouchEventWithLatencyInfo(touch, latency));
   }
 
   void SendEventAckIfNecessary(const blink::WebInputEvent& event,
                                InputEventAckState ack_result) {
     if (!ui::WebInputEventTraits::ShouldBlockEventStream(event))
       return;
-    InputEventAck ack(event.type, ack_result);
+    InputEventAck ack(InputEventAckSource::COMPOSITOR_THREAD, event.type,
+                      ack_result);
     InputHostMsg_HandleInputEvent_ACK response(0, ack);
     input_router_->OnMessageReceived(response);
   }
 
   void OnHasTouchEventHandlers(bool has_handlers) {
     input_router_->OnMessageReceived(
         ViewHostMsg_HasTouchEventHandlers(0, has_handlers));
   }
 
   size_t GetAndResetSentEventCount() {
@@ skipping 124 matching lines @@
 
 TEST_F(InputRouterImplPerfTest, TouchSwipeToGestureScroll) {
   SimulateTouchAndScrollEventSequence("TouchSwipeToGestureScroll ",
                                       kDefaultSteps,
                                       kDefaultOrigin,
                                       kDefaultDistance,
                                       kDefaultIterations);
 }
 
 }  // namespace content