Allow chromedriver to set local state preferences.

chrome/test/pyautolib/pyauto.py

Index: chrome/test/pyautolib/pyauto.py
diff --git a/chrome/test/pyautolib/pyauto.py b/chrome/test/pyautolib/pyauto.py
index fd55034818bcaba57b30a6d745f2a95ae5f184a5..67abd62bc729c0669e819468acfb1b158f8a403b 100755
--- a/chrome/test/pyautolib/pyauto.py
+++ b/chrome/test/pyautolib/pyauto.py
@@ -1171,10 +1171,11 @@ class PyUITest(pyautolib.PyUITestBase, unittest.TestCase):
     """
     cmd_dict = {
       'command': 'SetLocalStatePrefs',
+      'windex': 0,
       'path': path,
       'value': value,
     }
-    self._GetResultFromJSONRequest(cmd_dict)
+    self._GetResultFromJSONRequest(cmd_dict, windex=-1)
 
   def GetPrefsInfo(self):
     """Return info about preferences.
@@ -1214,10 +1215,11 @@ class PyUITest(pyautolib.PyUITestBase, unittest.TestCase):
     """
     cmd_dict = {
       'command': 'SetPrefs',
+      'windex': 0,
       'path': path,
       'value': value,
     }
-    self._GetResultFromJSONRequest(cmd_dict)
+    self._GetResultFromJSONRequest(cmd_dict, windex=-1)
 
   def SendWebkitKeyEvent(self, key_type, key_code, tab_index=0, windex=0):
     """Send a webkit key event to the browser.