Delay Input.dispatchKeyEvent response until after key event ack.

content/browser/site_per_process_browsertest.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/site_per_process_browsertest.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 186 matching lines @@
     return events_received_.front();
   }
   const std::vector<blink::WebInputEvent::Type>& events_received() {
     return events_received_;
   }
 
   void OnInputEvent(const blink::WebInputEvent& event) override {
     events_received_.push_back(event.type);
   };
 
+  void OnInputEventAck(const blink::WebInputEvent& event, bool is_synthetic)
+      override {};
+
  private:
   RenderWidgetHost* host_;
   std::vector<blink::WebInputEvent::Type> events_received_;
 
   DISALLOW_COPY_AND_ASSIGN(TestInputEventObserver);
 };
 
 // Helper function that performs a surface hittest.
 void SurfaceHitTestTestHelper(
     Shell* shell,
@@ skipping 8299 matching lines @@
   EXPECT_TRUE(NavigateToURL(shell(), b_url));
 
   base::string16 expected_title(base::UTF8ToUTF16("foo"));
   TitleWatcher title_watcher(popup2->web_contents(), expected_title);
   EXPECT_TRUE(ExecuteScript(
       shell(), "window.open('','popup2').postMessage('foo', '*');"));
   EXPECT_EQ(expected_title, title_watcher.WaitAndGetTitle());
 }
 
 }  // namespace content