Add a SafeSearch preference, policy and implementation.

chrome/common/url_constants.cc

 // Copyright (c) 2012 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/common/url_constants.h"
 
 #include "googleurl/src/url_util.h"
 
 namespace chrome {
 
@@ skipping 476 matching lines @@
   kChromeUIGpuCleanURL,
   kChromeUIGpuCrashURL,
   kChromeUIGpuHangURL,
 };
 const int kNumberOfChromeDebugURLs =
     static_cast<int>(arraysize(kChromeDebugURLs));
 
 const char kExtensionScheme[] = "chrome-extension";
 const char kExtensionResourceScheme[] = "chrome-extension-resource";
 
+// Safesearch query parameters.
+const char kSafeSearchSafeParameter[] = "safe=active";
+const char kSafeSearchSsuiParameter[] = "ssui=on";
+
 }  // namespace chrome