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 190 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) 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 8431 matching lines @@
   // hit the 20 seconds delay before https://crbug.com/657195 was fixed.
   EXPECT_TRUE(NavigateToURL(shell(), page_url));
   EXPECT_EQ(page_url, shell()->web_contents()->GetLastCommittedURL());
 
   // Note: even if the test fails and for some reason, the test has not timed
   // out by this point, the test teardown code will still hit a DCHECK when it
   // calls AssertNoURLRequests() in the shell's URLRequestContext destructor.
 }
 
 }  // namespace content