Added one testcases to Instant.

functional/instant.py

Index: functional/instant.py
===================================================================
--- functional/instant.py	(revision 71508)
+++ functional/instant.py	(working copy)
@@ -21,6 +21,16 @@
     info = self.GetInstantInfo()
     return info.get('current') and not info.get('loading')
 
+  def _CanDismissInstant(self):
+    test_dir = os.path.join(os.path.abspath(self.DataDir()), 'google')
+    file_path = os.path.join(test_dir, 'google.html')
+    file_url = self.GetFileURLForPath(file_path)
+    self.SetOmniboxText(file_url)
+    self.assertTrue(self.WaitUntil(self._DoneLoading))
+    location = self.GetInstantInfo()['location']
+    self.assertTrue('google.html' in location,
+                    msg='No google.html in %s' % location)
+    
   def testInstantNavigation(self):
     """Test that instant navigates based on omnibox input."""
     self.SetOmniboxText('google.com')
@@ -63,6 +73,29 @@
     self.assertFalse(self.GetInstantInfo()['active'],
                      'Instant enabled for javascript URL.')
 
-
+  def testInstantCanDismiss(self):
+    """Test that instant preview is dismissed by 
+       find-in-page, new tab page, extenions page, new window."""
+    #Test with find-in-page
+    self._CanDismissInstant()
+    self.OpenFindInPage()
+    self.assertEqual(self.GetActiveTabTitle(), '')
+    #Test with new tab page. 
+    self._CanDismissInstant()
+    self.AppendTab(pyauto.GURL('chrome://newtab'))
+    self.RunCommand(pyauto.IDC_CLOSE_TAB)
+    self.assertEqual(self.GetActiveTabTitle(), '')
+    #Test with extensions page
+    self._CanDismissInstant()
+    self.AppendTab(pyauto.GURL('chrome://extensions'))
+    self.RunCommand(pyauto.IDC_CLOSE_TAB)
+    self.assertEqual(self.GetActiveTabTitle(), '')
+    #Test with new window
+    self._CanDismissInstant()
+    self.RunCommand(pyauto.IDC_NEW_WINDOW)
+    self.CloseBrowserWindow(1)
+    self.assertEqual(self.GetActiveTabTitle(), '')
+    self._CanDismissInstant()
+    
 if __name__ == '__main__':
   pyauto_functional.Main()