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

content/public/test/browser_test_utils.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_TEST_BROWSER_TEST_UTILS_H_
 #define CONTENT_PUBLIC_TEST_BROWSER_TEST_UTILS_H_
 
 #include <queue>
 #include <string>
 #include <vector>
@@ skipping 534 matching lines @@
 // Watches for an input msg to be consumed.
 class InputMsgWatcher : public BrowserMessageFilter {
  public:
   InputMsgWatcher(RenderWidgetHost* render_widget_host,
                   blink::WebInputEvent::Type type);
 
   // Wait until ack message occurs, returning the ack result from
   // the message.
   uint32_t WaitForAck();
 
+  uint32_t last_event_ack_source() const { return ack_source_; }
+
  private:
   ~InputMsgWatcher() override;
 
   // Overridden BrowserMessageFilter methods.
   bool OnMessageReceived(const IPC::Message& message) override;
 
-  void ReceivedAck(blink::WebInputEvent::Type ack_type, uint32_t ack_state);
+  void ReceivedAck(blink::WebInputEvent::Type ack_type,
+                   uint32_t ack_state,
+                   uint32_t ack_source);
 
   blink::WebInputEvent::Type wait_for_type_;
   uint32_t ack_result_;
+  uint32_t ack_source_;
   base::Closure quit_;
 
   DISALLOW_COPY_AND_ASSIGN(InputMsgWatcher);
 };
 
 // Sets up a ui::TestClipboard for use in browser tests. On Windows,
 // clipboard is handled on the IO thread, BrowserTestClipboardScope
 // hops messages onto the right thread.
 class BrowserTestClipboardScope {
  public:
@@ skipping 130 matching lines @@
 
   // The MessageLoopRunner used to spin the message loop.
   scoped_refptr<MessageLoopRunner> message_loop_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(ConsoleObserverDelegate);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_BROWSER_TEST_UTILS_H_