Allow chromedriver to set local state preferences.

chrome/test/automation/automation_json_requests.h

 // 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.
 
 #ifndef CHROME_TEST_AUTOMATION_AUTOMATION_JSON_REQUESTS_H_
 #define CHROME_TEST_AUTOMATION_AUTOMATION_JSON_REQUESTS_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 436 matching lines @@
     const std::string& extension_id,
     bool browser_action,
     std::string* error_msg) WARN_UNUSED_RESULT;
 
 // Requests the given extension be uninstalled. Returns true on success.
 bool SendUninstallExtensionJSONRequest(
     AutomationMessageSender* sender,
     const std::string& extension_id,
     std::string* error_msg) WARN_UNUSED_RESULT;
 
+// Requests the local state preference to be set to the given value.
+// Ownership of |value| is taken by this function. Returns true on success.
+bool SendSetLocalStatePreferenceJSONRequest(
+    AutomationMessageSender* sender,
+    const std::string& pref,
+    base::Value* value,
+    std::string* error_msg) WARN_UNUSED_RESULT;
+
+// Requests the user preference to be set to the given value.
+// Ownership of |value| is taken by this function. Returns true on success.
+bool SendSetPreferenceJSONRequest(
+    AutomationMessageSender* sender,
+    const std::string& pref,
+    base::Value* value,
+    std::string* error_msg) WARN_UNUSED_RESULT;
+
 #endif  // CHROME_TEST_AUTOMATION_AUTOMATION_JSON_REQUESTS_H_