Implement the target locator commands for ChromeDriver.

chrome/test/webdriver/WEBDRIVER_TESTS

 # Copyright (c) 2011 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.
 #
 # This file lists the webdriver tests that run as a part of the functional test
 # suite.
 #
 # Tests can be enabled on a per-platform basis. Tests not listed here will
 # not be run.
 #
@@ skipping 33 matching lines @@
     '-executing_javascript_test.ExecutingJavaScriptTests.testShouldBeAbleToPassACollectionAsArgument',
     '-executing_javascript_test.ExecutingJavaScriptTests.testShouldBeAbleToPassAWebElementAsArgument',
     '-executing_javascript_test.ExecutingJavaScriptTests.testShouldBeAbleToPassAnArrayAsArgument',
     '-executing_javascript_test.ExecutingJavaScriptTests.testPassingAndReturningADoubleShouldReturnADecimal',
     '-executing_javascript_test.ExecutingJavaScriptTests.testPassingAndReturningALongShouldReturnAWholeNumber',
     '-executing_javascript_test.ExecutingJavaScriptTests.testShouldBeAbleToPassABooleanAnAsArgument',
     '-executing_javascript_test.ExecutingJavaScriptTests.testShouldBeAbleToPassANumberAnAsArgument',
     '-executing_javascript_test.ExecutingJavaScriptTests.testShouldBeAbleToPassAStringAnAsArgument',
     '-executing_javascript_test.ExecutingJavaScriptTests.testShouldBeAbleToPassInMoreThanOneArgument',
 #   'form_handling_tests',
-#   'frame_switching_tests',
+    'frame_switching_tests',
+    # Next two frame switching tests are disabled because they depend on toggle.
+    '-frame_switching_tests.FrameSwitchingTest.testThatWeCanSwitchFrameByName',
+    '-frame_switching_tests.FrameSwitchingTest.testThatWeCanSwitchToFrameByIndex',
 #   'implicit_waits_tests',
     'page_loading_tests',
     # testShouldReturnWhenGettingAUrlThatDoesNotResolve causes the test after
     # to fail when run in xvfb: crbug.com/72027.
     '-page_loading_tests.PageLoadingTests.testShouldReturnWhenGettingAUrlThatDoesNotResolve',
     '-page_loading_tests.PageLoadingTests.testShouldBeAbleToNavigateBackInTheBrowserHistory',
     '-page_loading_tests.PageLoadingTests.testShouldBeAbleToNavigateBackInTheBrowserHistoryInPresenceOfIframes',
     '-page_loading_tests.PageLoadingTests.testShouldBeAbleToNavigateForwardsInTheBrowserHistory',
     # This test is flaky.
     '-page_loading_tests.PageLoadingTests.testShouldWaitForDocumentToBeLoaded',
@@ skipping 14 matching lines @@
   'mac': [
 
   ],
 
   'linux': [
     'typing_tests',
     # needs clear command
     '-typing_tests.TypingTests.testNumberpadAndFunctionKeys',
   ],
 }