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

content/browser/renderer_host/render_widget_host_view_mac_unittest.mm

 // Copyright (c) 2012 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/browser/renderer_host/render_widget_host_view_mac.h"
 
 #include <Cocoa/Cocoa.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <tuple>
@@ skipping 936 matching lines @@
   // Send an initial wheel event with NSEventPhaseBegan to the view.
   NSEvent* event1 = MockScrollWheelEventWithPhase(@selector(phaseBegan), 0);
   [view->cocoa_view() scrollWheel:event1];
   ASSERT_EQ(1U, process_host->sink().message_count());
 
   // Flush and clear other messages (e.g. begin frames) the RWHVMac also sends.
   base::RunLoop().RunUntilIdle();
   process_host->sink().ClearMessages();
 
   // Send an ACK for the first wheel event, so that the queue will be flushed.
-  InputEventAck ack(blink::WebInputEvent::MouseWheel,
+  InputEventAck ack(InputEventAckSource::COMPOSITOR_THREAD,
+                    blink::WebInputEvent::MouseWheel,
                     INPUT_EVENT_ACK_STATE_CONSUMED);
   std::unique_ptr<IPC::Message> response(
       new InputHostMsg_HandleInputEvent_ACK(0, ack));
   host->OnMessageReceived(*response);
 
   // Post the NSEventPhaseEnded wheel event to NSApp and check whether the
   // render view receives it.
   NSEvent* event2 = MockScrollWheelEventWithPhase(@selector(phaseEnded), 0);
   [NSApp postEvent:event2 atStart:NO];
   base::RunLoop().RunUntilIdle();
@@ skipping 24 matching lines @@
       [[MockRenderWidgetHostViewMacDelegate alloc] init]);
   view->SetDelegate(view_delegate.get());
 
   // Send an initial wheel event for scrolling by 3 lines.
   NSEvent* event1 = MockScrollWheelEventWithPhase(@selector(phaseBegan), 3);
   [view->cocoa_view() scrollWheel:event1];
   ASSERT_EQ(1U, process_host->sink().message_count());
   process_host->sink().ClearMessages();
 
   // Indicate that the wheel event was unhandled.
-  InputEventAck unhandled_ack(blink::WebInputEvent::MouseWheel,
+  InputEventAck unhandled_ack(InputEventAckSource::COMPOSITOR_THREAD,
+                              blink::WebInputEvent::MouseWheel,
                               INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
   std::unique_ptr<IPC::Message> response1(
       new InputHostMsg_HandleInputEvent_ACK(0, unhandled_ack));
   host->OnMessageReceived(*response1);
   ASSERT_EQ(2U, process_host->sink().message_count());
   process_host->sink().ClearMessages();
 
-  InputEventAck unhandled_scroll_ack(blink::WebInputEvent::GestureScrollUpdate,
+  InputEventAck unhandled_scroll_ack(InputEventAckSource::COMPOSITOR_THREAD,
+                                     blink::WebInputEvent::GestureScrollUpdate,
                                      INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
   std::unique_ptr<IPC::Message> scroll_response1(
       new InputHostMsg_HandleInputEvent_ACK(0, unhandled_scroll_ack));
   host->OnMessageReceived(*scroll_response1);
 
   // Check that the view delegate got an unhandled wheel event.
   ASSERT_EQ(YES, view_delegate.get().unhandledWheelEventReceived);
   view_delegate.get().unhandledWheelEventReceived = NO;
 
   // Send another wheel event, this time for scrolling by 0 lines (empty event).
@@ skipping 140 matching lines @@
   process_host_ = new MockRenderProcessHost(&browser_context);
   process_host_->Init();
   MockRenderWidgetHostDelegate delegate;
   int32_t routing_id = process_host_->GetNextRoutingID();
   MockRenderWidgetHostImpl* host =
       new MockRenderWidgetHostImpl(&delegate, process_host_, routing_id);
   RenderWidgetHostViewMac* view = new RenderWidgetHostViewMac(host, false);
   process_host_->sink().ClearMessages();
 
   // We'll use this IPC message to ack events.
-  InputEventAck ack(blink::WebInputEvent::GesturePinchUpdate,
+  InputEventAck ack(InputEventAckSource::COMPOSITOR_THREAD,
+                    blink::WebInputEvent::GesturePinchUpdate,
                     INPUT_EVENT_ACK_STATE_CONSUMED);
   std::unique_ptr<IPC::Message> response(
       new InputHostMsg_HandleInputEvent_ACK(0, ack));
 
   // Do a gesture that crosses the threshold.
   {
     NSEvent* pinchBeginEvent =
         MockGestureEvent(NSEventTypeBeginGesture, 0);
     NSEvent* pinchUpdateEvents[3] = {
         MockGestureEvent(NSEventTypeMagnify, 0.25),
@@ skipping 396 matching lines @@
   // Verify that this IPC is asking for no monitoring or immediate updates.
   InputMsg_RequestCompositionUpdate::Read(composition_request_msg_for_child,
                                           &child_msg_params);
   is_child_msg_for_immediate_request = std::get<0>(child_msg_params);
   is_child_msg_for_monitor_request = std::get<1>(child_msg_params);
   EXPECT_FALSE(is_child_msg_for_immediate_request);
   EXPECT_FALSE(is_child_msg_for_monitor_request);
 }
 
 }  // namespace content