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

chrome/common/pref_names.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/common/pref_names.h"
 
 namespace prefs {
 
 // *************** PROFILE PREFS ***************
 // These are attached to the user profile
@@ skipping 1264 matching lines @@
 const char kSignedSettingsTempStorage[] = "signed_settings_temp_storage";
 
 // The hardware keyboard layout of the device. This should look like
 // "xkb:us::eng".
 const char kHardwareKeyboardLayout[] = "intl.hardware_keyboard";
 #endif
 
 // Whether there is a Flash version installed that supports clearing LSO data.
 const char kClearPluginLSODataEnabled[] = "browser.clear_lso_data_enabled";
 
+// String which specifies where to store the disk cache.
+const char kDiskCacheDir[] = "browser.disk_cache_dir";
+
 // *************** SERVICE PREFS ***************
 // These are attached to the service process.
 
 const char kCloudPrintProxyEnabled[] = "cloud_print.enabled";
 // The unique id for this instance of the cloud print proxy.
 const char kCloudPrintProxyId[] = "cloud_print.proxy_id";
 // The GAIA auth token for Cloud Print
 const char kCloudPrintAuthToken[] = "cloud_print.auth_token";
 // The GAIA auth token used by Cloud Print to authenticate with the XMPP server
 // This should eventually go away because the above token should work for both.
@@ skipping 63 matching lines @@
   "custom_handlers.registered_protocol_handlers";
 
 // List of protocol handlers the user has requested not to be asked about again.
 const char kIgnoredProtocolHandlers[] =
   "custom_handlers.ignored_protocol_handlers";
 
 // Whether user-specified handlers for protocols and content types can be
 // specified.
 const char kCustomHandlersEnabled[] = "custom_handlers.enabled";
 }  // namespace prefs