[ChromeDriver] Support mobile emulation on desktop Chrome.

chrome/test/chromedriver/chrome/stub_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_STUB_WEB_VIEW_H_
 #define CHROME_TEST_CHROMEDRIVER_CHROME_STUB_WEB_VIEW_H_
 
 #include <list>
 #include <string>
 
@@ skipping 44 matching lines @@
   virtual Status GetCookies(scoped_ptr<base::ListValue>* cookies) OVERRIDE;
   virtual Status DeleteCookie(const std::string& name,
                               const std::string& url) OVERRIDE;
   virtual Status WaitForPendingNavigations(const std::string& frame_id,
                                            const base::TimeDelta& timeout,
                                            bool stop_load_on_timeout) OVERRIDE;
   virtual Status IsPendingNavigation(
       const std::string& frame_id, bool* is_pending) OVERRIDE;
   virtual JavaScriptDialogManager* GetJavaScriptDialogManager() OVERRIDE;
   virtual Status OverrideGeolocation(const Geoposition& geoposition) OVERRIDE;
+  virtual Status OverrideDeviceMetrics(const DeviceMetrics& device_metrics) OVERRIDE;
   virtual Status CaptureScreenshot(std::string* screenshot) OVERRIDE;
   virtual Status SetFileInputFiles(
       const std::string& frame,
       const base::DictionaryValue& element,
       const std::vector<base::FilePath>& files) OVERRIDE;
   virtual Status TakeHeapSnapshot(scoped_ptr<base::Value>* snapshot) OVERRIDE;
 
  private:
   std::string id_;
 };
 
 #endif  // CHROME_TEST_CHROMEDRIVER_CHROME_STUB_WEB_VIEW_H_