[ChromeDriver] Support mobile emulation on desktop Chrome.

chrome/test/chromedriver/chrome/web_view.h

 // Copyright (c) 2013 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 CHROME_TEST_CHROMEDRIVER_CHROME_WEB_VIEW_H_
 #define CHROME_TEST_CHROMEDRIVER_CHROME_WEB_VIEW_H_
 
 #include <list>
 #include <string>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 
 namespace base {
 class DictionaryValue;
 class FilePath;
 class ListValue;
 class TimeDelta;
 class Value;
 }
 
+class DeviceMetrics;
 class DevToolsClient;
 struct Geoposition;
 class JavaScriptDialogManager;
 struct KeyEvent;
 struct MouseEvent;
 struct TouchEvent;
 class Status;
 
 class WebView {
  public:
@@ skipping 118 matching lines @@
       const std::vector<base::FilePath>& files) = 0;
 
   // Take a heap snapshot which can build up a graph of Javascript objects.
   // A raw heap snapshot is in JSON format:
   //  1. A meta data element "snapshot" about how to parse data elements.
   //  2. Data elements: "nodes", "edges", "strings".
   virtual Status TakeHeapSnapshot(scoped_ptr<base::Value>* snapshot) = 0;
 };
 
 #endif  // CHROME_TEST_CHROMEDRIVER_CHROME_WEB_VIEW_H_