Implemented a policy for centralized setting of the --disk-cache-dir flag.

chrome/common/pref_names.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.
 
 // Constants for the names of various preferences, for easier changing.
 
 #ifndef CHROME_COMMON_PREF_NAMES_H_
 #define CHROME_COMMON_PREF_NAMES_H_
 #pragma once
 
@@ skipping 468 matching lines @@
 extern const char kManagedPopupsAllowedForUrls[];
 extern const char kManagedPopupsBlockedForUrls[];
 
 #if defined(OS_CHROMEOS)
 extern const char kSignedSettingsTempStorage[];
 extern const char kHardwareKeyboardLayout[];
 #endif
 
 extern const char kClearPluginLSODataEnabled[];
 
+extern const char kDiskCacheDir[];
+
 extern const char kRegisteredBackgroundContents[];
 
 extern const char kAuthSchemes[];
 extern const char kDisableAuthNegotiateCnameLookup[];
 extern const char kEnableAuthNegotiatePort[];
 extern const char kAuthServerWhitelist[];
 extern const char kAuthNegotiateDelegateWhitelist[];
 extern const char kGSSAPILibraryName[];
 
 extern const char kRegisteredProtocolHandlers[];
 extern const char kIgnoredProtocolHandlers[];
 extern const char kCustomHandlersEnabled[];
 
 extern const char kUserCreatedLoginItem[];
 extern const char kBackgroundModeEnabled[];
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_