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

chrome/browser/policy/configuration_policy_pref_store_unittest.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 "base/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/policy/configuration_policy_pref_store.h"
 #include "chrome/browser/policy/mock_configuration_policy_provider.h"
 #include "chrome/browser/prefs/proxy_config_dictionary.h"
 #include "chrome/common/pref_names.h"
@@ skipping 110 matching lines @@
                     prefs::kApplicationLocale),
         TypeAndName(kPolicyAuthSchemes,
                     prefs::kAuthSchemes),
         TypeAndName(kPolicyAuthServerWhitelist,
                     prefs::kAuthServerWhitelist),
         TypeAndName(kPolicyAuthNegotiateDelegateWhitelist,
                     prefs::kAuthNegotiateDelegateWhitelist),
         TypeAndName(kPolicyDownloadDirectory,
                     prefs::kDownloadDefaultDirectory),
         TypeAndName(kPolicyGSSAPILibraryName,
-                    prefs::kGSSAPILibraryName)));
+                    prefs::kGSSAPILibraryName),
+        TypeAndName(kPolicyDiskCacheDir,
+                    prefs::kDiskCacheDir)));
 
 // Test cases for boolean-valued policy settings.
 class ConfigurationPolicyPrefStoreBooleanTest
     : public ConfigurationPolicyPrefStoreTestBase<
                  testing::TestWithParam<TypeAndName> > {
 };
 
 TEST_P(ConfigurationPolicyPrefStoreBooleanTest, GetDefault) {
   EXPECT_EQ(PrefStore::READ_NO_VALUE,
             store_->GetValue(GetParam().pref_name(), NULL));
@@ skipping 681 matching lines @@
 
   provider_.SetInitializationComplete(true);
   EXPECT_FALSE(store_->IsInitializationComplete());
 
   store_->OnUpdatePolicy();
   Mock::VerifyAndClearExpectations(&observer_);
   EXPECT_TRUE(store_->IsInitializationComplete());
 }
 
 }  // namespace policy