Added code to persist downloaded cloud policy to disk.

chrome/browser/policy/cloud_policy_store.h

 // 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.
 
 #ifndef CHROME_BROWSER_POLICY_CLOUD_POLICY_STORE_H_
 #define CHROME_BROWSER_POLICY_CLOUD_POLICY_STORE_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
@@ skipping 55 matching lines @@
   }
   bool is_managed() const {
     return policy_.get() &&
            policy_->state() == enterprise_management::PolicyData::ACTIVE;
   }
   Status status() const { return status_; }
   CloudPolicyValidatorBase::Status validation_status() const {
     return validation_status_;
   }
 
-  // Store a new policy blob. Pending store operations will be canceled. The
-  // store operation may proceed asynchronously and observers are notified once
-  // the operation finishes. If successful, OnStoreLoaded() will be invoked on
-  // the observers and the updated policy can be read through policy(). Errors
-  // generate OnStoreError() notifications.
+  // Store a new policy blob. Pending load/store operations will be canceled.
+  // The store operation may proceed asynchronously and observers are notified
+  // once the operation finishes. If successful, OnStoreLoaded() will be invoked
+  // on the observers and the updated policy can be read through policy().
+  // Errors generate OnStoreError() notifications.
   virtual void Store(
       const enterprise_management::PolicyFetchResponse& policy) = 0;
 
-  // Load the current policy blob from persistent storage. This may trigger
-  // asynchronous operations. Upon success, OnStoreLoaded() will be called on
-  // the registered observers. Otherwise, OnStoreError() reports the reason for
-  // failure.
+  // Load the current policy blob from persistent storage. Pending load/store
+  // operations will be canceled. This may trigger asynchronous operations.
+  // Upon success, OnStoreLoaded() will be called on the registered observers.
+  // Otherwise, OnStoreError() reports the reason for failure.
   virtual void Load() = 0;
 
   // Deletes any existing policy blob and notifies observers via OnStoreLoaded()
   // that the blob has changed. Virtual for mocks.
   virtual void Clear();
 
   // Registers an observer to be notified when policy changes.
   void AddObserver(Observer* observer);
 
   // Removes the specified observer.
@@ skipping 31 matching lines @@
   bool is_initialized_;
 
   ObserverList<Observer, true> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(CloudPolicyStore);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_CLOUD_POLICY_STORE_H_