Moved JsonPrefStore to use SequencedWorkerPool

chrome/browser/policy/managed_mode_policy_provider.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_MANAGED_MODE_POLICY_PROVIDER_H_
 #define CHROME_BROWSER_POLICY_MANAGED_MODE_POLICY_PROVIDER_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/prefs/persistent_pref_store.h"
 #include "chrome/browser/policy/configuration_policy_provider.h"
 
 class Profile;
 
+namespace base {
+class SequencedTaskRunner;
+}
+
 namespace policy {
 
 // This class sets policies that are defined by a local user via "Managed Mode".
 // It offers methods to set and read policies, and persists them on disk in
 // JSON format.
 class ManagedModePolicyProvider
     : public ConfigurationPolicyProvider,
       public PrefStore::Observer {
  public:
   // The dictionary key under which we store the policy dictionary. Public for
   // testing.
   static const char kPolicies[];
 
   // Creates a new ManagedModePolicyProvider that caches its policies in a JSON
-  // file inside the profile folder.
-  static ManagedModePolicyProvider* Create(Profile* profile);
+  // file inside the profile folder. |sequenced_task_runner| ensures that all
+  // file I/O operations are executed in the order that does not collide
+  // with Profile's file operations.
+  static ManagedModePolicyProvider* Create(
+      Profile* profile,
+      base::SequencedTaskRunner* sequenced_task_runner);
 
   // Use this constructor to inject a different PrefStore (e.g. for testing).
   explicit ManagedModePolicyProvider(PersistentPrefStore* store);
   virtual ~ManagedModePolicyProvider();
 
   // Returns the stored value for a policy with the given |key|, or NULL if no
   // such policy is defined.
   const base::Value* GetPolicy(const std::string& key) const;
   // Sets the policy with the given |key| to a copy of the given |value|.
   void SetPolicy(const std::string& key, const base::Value* value);
@@ skipping 12 matching lines @@
   void UpdatePolicyFromCache();
 
   // Used for persisting policies. Unlike other PrefStores, this one is not
   // hooked up to the PrefService.
   scoped_refptr<PersistentPrefStore> store_;
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_MANAGED_MODE_POLICY_PROVIDER_H_