[chromedriver] Support clicking an element in sub frames.

chrome/test/chromedriver/run_py_tests.py

Index: chrome/test/chromedriver/run_py_tests.py
diff --git a/chrome/test/chromedriver/run_py_tests.py b/chrome/test/chromedriver/run_py_tests.py
index 0f7505fb41e9442ebf830e1319855cb7985af7ab..89335bd38341c460ca65dbeecd8d57809e1896fb 100755
--- a/chrome/test/chromedriver/run_py_tests.py
+++ b/chrome/test/chromedriver/run_py_tests.py
@@ -269,6 +269,13 @@ class ChromeDriverTest(ChromeDriverBaseTest):
     div.Click()
     self.assertEquals(1, len(self._driver.FindElements('tag name', 'br')))
 
+  def testClickElementInSubFrame(self):
+    self._driver.Load(self.GetHttpUrlForFile('/chromedriver/frame_test.html'))
+    frame = self._driver.FindElement('tag name', 'iframe')
+    self._driver.SwitchToFrame(frame)
+    # Test clicking element in the sub frame.
+    self.testClickElement()
+
   def testClearElement(self):
     text = self._driver.ExecuteScript(
         'document.body.innerHTML = \'<input type="text" value="abc">\';'