Allow chromedriver to set local state preferences.

chrome/test/automation/automation_json_requests.cc

 // 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.
 
 #include "chrome/test/automation/automation_json_requests.h"
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/format_macros.h"
 #include "base/json/json_reader.h"
@@ skipping 788 matching lines @@
   if (!reply_dict.GetBoolean("success", &success)) {
     *error_msg = "Missing or invalid 'success'";
     return false;
   }
   if (!success) {
     *error_msg = "Extension uninstall not permitted";
     return false;
   }
   return true;
 }
+
+bool SendSetLocalStatePreferenceJSONRequest(
+    AutomationMessageSender* sender,
+    const std::string& pref,
+    base::Value* value,
+    std::string* error_msg) {
+  DictionaryValue dict;
+  dict.SetString("command", "SetLocalStatePrefs");
+  dict.SetString("path", pref);
+  dict.Set("value", value);
+  DictionaryValue reply_dict;
+  return SendAutomationJSONRequest(sender, dict, &reply_dict, error_msg);
+}
+
+bool SendSetPreferenceJSONRequest(
+    AutomationMessageSender* sender,
+    const std::string& pref,
+    base::Value* value,
+    std::string* error_msg) {
+  DictionaryValue dict;
+  dict.SetString("command", "SetPrefs");
+  dict.SetInteger("windex", 0);
+  dict.SetString("path", pref);
+  dict.Set("value", value);
+  DictionaryValue reply_dict;
+  return SendAutomationJSONRequest(sender, dict, &reply_dict, error_msg);
+}