[ChromeDriver] Support mobile emulation on desktop Chrome.

chrome/test/chromedriver/test/run_py_tests.py

Index: chrome/test/chromedriver/test/run_py_tests.py
diff --git a/chrome/test/chromedriver/test/run_py_tests.py b/chrome/test/chromedriver/test/run_py_tests.py
index d5ee27e9bee28bf61067e93050dd7f68d8ff7e27..0b44f4ffac8d54b368ee6c6338de88c1688da406 100755
--- a/chrome/test/chromedriver/test/run_py_tests.py
+++ b/chrome/test/chromedriver/test/run_py_tests.py
@@ -809,6 +809,52 @@ class ChromeLogPathCapabilityTest(ChromeDriverBaseTest):
     self.assertTrue(self.LOG_MESSAGE in open(tmp_log_path.name).read())
 
 
+class MobileEmulationCapabilityTest(ChromeDriverBaseTest):
+  """Tests that ChromeDriver processes chromeOptions.mobileEmulation capabilities.
+
+  Makes sure the device metrics are overridden in DevTools and user agent is
+  overridden in Chrome.
+  """
+
+  @staticmethod
+  def GlobalSetUp():
+    MobileEmulationCapabilityTest._http_server = webserver.WebServer(
+        chrome_paths.GetTestData())
+    MobileEmulationCapabilityTest._http_server.SetCallbackForPath(
+        '/userAgent', MobileEmulationCapabilityTest.respondWithUserAgentString)
+
+  @staticmethod
+  def GlobalTearDown():
+    MobileEmulationCapabilityTest._http_server.Shutdown()
+
+  @staticmethod
+  def respondWithUserAgentString(request):
+    return request.GetHeader('User-Agent')
+
+  def testDeviceMetrics(self):
+    driver = self.CreateDriver(
+        mobile_emulation = {
+            'deviceMetrics': {'width': 360, 'height': 640, 'pixelRatio': 3}})
+    self.assertEqual(360, driver.ExecuteScript('return window.innerWidth'))
+    self.assertEqual(640, driver.ExecuteScript('return window.innerHeight'))
+
+  def testUserAgent(self):
+    driver = self.CreateDriver(
+        mobile_emulation = {'userAgent': 'Agent Smith'})
+    driver.Load(self._http_server.GetUrl() + '/userAgent')
+    body_tag = driver.FindElement('tag name', 'body')
+    self.assertEqual("'Agent Smith'", body_tag.GetText())
+
+  def testDeviceName(self):
+    driver = self.CreateDriver(
+        mobile_emulation = {'deviceName': 'Google Nexus 5'})
+    driver.Load(self._http_server.GetUrl() + '/userAgent')
+    self.assertEqual(360, driver.ExecuteScript('return window.innerWidth'))
+    self.assertEqual(640, driver.ExecuteScript('return window.innerHeight'))
+    body_tag = driver.FindElement('tag name', 'body')
+    self.assertEqual("'Mozilla/5.0 (Linux; Android 4.2.1; en-us; Nexus 5 Build/JOP40D) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.166 Mobile Safari/535.19'", body_tag.GetText())
+
+
 class ChromeDriverLogTest(unittest.TestCase):
   """Tests that chromedriver produces the expected log file."""
 
@@ -1002,6 +1048,8 @@ if __name__ == '__main__':
       sys.modules[__name__])
   tests = unittest_util.FilterTestSuite(all_tests_suite, options.filter)
   ChromeDriverTest.GlobalSetUp()
+  MobileEmulationCapabilityTest.GlobalSetUp()
   result = unittest.TextTestRunner(stream=sys.stdout, verbosity=2).run(tests)
   ChromeDriverTest.GlobalTearDown()
+  MobileEmulationCapabilityTest.GlobalTearDown()
   sys.exit(len(result.failures) + len(result.errors))