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

content/browser/renderer_host/render_widget_host_view_aura_unittest.cc

 // 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_aura.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <tuple>
@@ skipping 565 matching lines @@
     // RendererFrameManager singleton survives and and the MessageLoop gets
     // destroyed. The correct fix would be to have base::ObserverListThreadSafe
     // look
     // up the proper message loop every time (see crbug.com/443824.)
     RendererFrameManager::GetInstance()->OnMemoryPressure(level);
   }
 
   void SendInputEventACK(WebInputEvent::Type type,
       InputEventAckState ack_result) {
     DCHECK(!WebInputEvent::isTouchEventType(type));
-    InputEventAck ack(type, ack_result);
+    InputEventAck ack(InputEventAckSource::COMPOSITOR_THREAD, type, ack_result);
     InputHostMsg_HandleInputEvent_ACK response(0, ack);
     widget_host_->OnMessageReceived(response);
   }
 
   void SendTouchEventACK(WebInputEvent::Type type,
                          InputEventAckState ack_result,
                          uint32_t event_id) {
     DCHECK(WebInputEvent::isTouchEventType(type));
-    InputEventAck ack(type, ack_result, event_id);
+    InputEventAck ack(InputEventAckSource::COMPOSITOR_THREAD, type, ack_result,
+                      event_id);
     InputHostMsg_HandleInputEvent_ACK response(0, ack);
     widget_host_->OnMessageReceived(response);
   }
 
   size_t GetSentMessageCountAndResetSink() {
     size_t count = sink_->message_count();
     sink_->ClearMessages();
     return count;
   }
 
@@ skipping 729 matching lines @@
 
   // Now start a touch event, and remove the event-handlers before the release.
   view_->OnTouchEvent(&press);
   EXPECT_TRUE(press.synchronous_handling_disabled());
   EXPECT_EQ(ui::MotionEvent::ACTION_DOWN, pointer_state().GetAction());
   EXPECT_EQ(1U, pointer_state().GetPointerCount());
 
   widget_host_->OnMessageReceived(ViewHostMsg_HasTouchEventHandlers(0, false));
 
   // Ack'ing the outstanding event should flush the pending touch queue.
-  InputEventAck ack(blink::WebInputEvent::TouchStart,
-                    INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS,
-                    press.unique_event_id());
+  InputEventAck ack(
+      InputEventAckSource::COMPOSITOR_THREAD, blink::WebInputEvent::TouchStart,
+      INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS, press.unique_event_id());
   widget_host_->OnMessageReceived(InputHostMsg_HandleInputEvent_ACK(0, ack));
   EXPECT_EQ(0U, GetSentMessageCountAndResetSink());
 
   ui::TouchEvent move2(ui::ET_TOUCH_MOVED, gfx::Point(20, 20), 0,
                        base::TimeTicks::Now());
   view_->OnTouchEvent(&move2);
   EXPECT_TRUE(press.synchronous_handling_disabled());
   EXPECT_EQ(ui::MotionEvent::ACTION_MOVE, pointer_state().GetAction());
   EXPECT_EQ(1U, pointer_state().GetPointerCount());
 
@@ skipping 3331 matching lines @@
 
     // Retrieve the selected text from clipboard and verify it is as expected.
     base::string16 result_text;
     clipboard->ReadText(ui::CLIPBOARD_TYPE_SELECTION, &result_text);
     EXPECT_EQ(expected_text, result_text);
   }
 }
 #endif
 
 }  // namespace content