Pref service: add support for tracked prefs.

chrome/browser/prefs/profile_pref_store_manager.h

 // Copyright 2014 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_PREFS_PROFILE_PREF_STORE_MANAGER_H_
 #define CHROME_BROWSER_PREFS_PROFILE_PREF_STORE_MANAGER_H_
 
 #include <stddef.h>
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "services/preferences/public/interfaces/preferences_configuration.mojom.h"
+#include "services/preferences/public/interfaces/tracked_preference_validation_delegate.mojom.h"
 
-class HashStoreContents;
 class PersistentPrefStore;
-class PrefHashStore;
 class PrefRegistry;
 class PrefService;
 
 namespace base {
 class DictionaryValue;
-class SequencedTaskRunner;
+class SequencedWorkerPool;
 }  // namespace base
 
-namespace prefs {
-namespace mojom {
-class TrackedPreferenceValidationDelegate;
-}
-}
-
 namespace service_manager {
 class Connector;
 }
 
 namespace user_prefs {
 class PrefRegistrySyncable;
 }  // namespace user_prefs
 
 // Provides a facade through which the user preference store may be accessed and
 // managed.
 class ProfilePrefStoreManager {
  public:
   // Instantiates a ProfilePrefStoreManager with the configuration required to
   // manage the user preferences of the profile at |profile_path|.
   // |tracking_configuration| is used for preference tracking.
   // |reporting_ids_count| is the count of all possible tracked preference IDs
   // (possibly greater than |tracking_configuration.size()|).
   // |seed| and |legacy_device_id| are used to track preference value changes
   // and must be the same on each launch in order to verify loaded preference
   // values.
   ProfilePrefStoreManager(
       const base::FilePath& profile_path,
       std::vector<prefs::mojom::TrackedPreferenceMetadataPtr>
           tracking_configuration,
       size_t reporting_ids_count,
       const std::string& seed,
-      const std::string& legacy_device_id,
-      PrefService* local_state);
+      const std::string& legacy_device_id);
 
   ~ProfilePrefStoreManager();
 
   static const bool kPlatformSupportsPreferenceTracking;
 
   // Register user prefs used by the profile preferences system.
   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 
   // Retrieves the time of the last preference reset event, if any, for
   // |pref_service|. Assumes that |pref_service| is backed by a PrefStore that
   // was built by ProfilePrefStoreManager.
   // If no reset has occurred, returns a null |Time|.
   static base::Time GetResetTime(PrefService* pref_service);
 
   // Clears the time of the last preference reset event, if any, for
   // |pref_service|. Assumes that |pref_service| is backed by a PrefStore that
   // was built by ProfilePrefStoreManager.
   static void ClearResetTime(PrefService* pref_service);
 
 #if defined(OS_WIN)
   // Call before startup tasks kick in to use a different registry path for
   // storing and validating tracked preference MACs. Callers are responsible
   // for ensuring that the key is deleted on shutdown. For testing only.
   static void SetPreferenceValidationRegistryPathForTesting(
       const base::string16* path);
 #endif
 
   // Creates a PersistentPrefStore providing access to the user preferences of
-  // the managed profile. If |on_reset| is provided, it will be invoked if a
-  // reset occurs as a result of loading the profile's prefs.
-  // An optional |validation_delegate| will be notified
-  // of the status of each tracked preference as they are checked.
+  // the managed profile. If |reset_on_load_observer| is provided, it will be
+  // notified if a reset occurs as a result of loading the profile's prefs. An
+  // optional |validation_delegate| will be notified of the status of each
+  // tracked preference as they are checked.
   PersistentPrefStore* CreateProfilePrefStore(
-      const scoped_refptr<base::SequencedTaskRunner>& io_task_runner,
-      const base::Closure& on_reset_on_load,
-      prefs::mojom::TrackedPreferenceValidationDelegate* validation_delegate,
+      base::SequencedWorkerPool* worker_pool,
+      prefs::mojom::ResetOnLoadObserverPtr reset_on_load_observer,
+      prefs::mojom::TrackedPreferenceValidationDelegatePtr validation_delegate,
       service_manager::Connector* connector,
       scoped_refptr<PrefRegistry> pref_registry);
 
   // Initializes the preferences for the managed profile with the preference
   // values in |master_prefs|. Acts synchronously, including blocking IO.
   // Returns true on success.
   bool InitializePrefsFromMasterPrefs(
       std::unique_ptr<base::DictionaryValue> master_prefs);
 
-  // Creates a single-file PrefStore as was used in M34 and earlier. Used only
-  // for testing migration.
-  PersistentPrefStore* CreateDeprecatedCombinedProfilePrefStore(
-      const scoped_refptr<base::SequencedTaskRunner>& io_task_runner);
+ private:
+  // Connects to the pref service over mojo and configures it.
+  void ConfigurePrefService(
+      prefs::mojom::ResetOnLoadObserverPtr reset_on_load_observer,
+      prefs::mojom::TrackedPreferenceValidationDelegatePtr validation_delegate,
+      service_manager::Connector* connector);
 
- private:
-  // Returns a PrefHashStore for the managed profile. Should only be called
-  // if |kPlatformSupportsPreferenceTracking|. |use_super_mac| determines
-  // whether the returned object will calculate, store, and validate super MACs
-  // (and, by extension, accept non-null newly protected preferences as
-  // TrustedInitialized).
-  std::unique_ptr<PrefHashStore> GetPrefHashStore(bool use_super_mac);
-
-  // Returns a PrefHashStore and HashStoreContents which can be be used for
-  // extra out-of-band verifications, or nullptrs if not available on this
-  // platform.
-  std::pair<std::unique_ptr<PrefHashStore>, std::unique_ptr<HashStoreContents>>
-  GetExternalVerificationPrefHashStorePair();
-
-  // Connects to the pref service over mojo and configures it.
-  void ConfigurePrefService(const base::Closure& on_reset_on_load,
-                            service_manager::Connector* connector);
+  prefs::mojom::TrackedPersistentPrefStoreConfigurationPtr
+  CreateTrackedPrefStoreConfiguration(
+      prefs::mojom::ResetOnLoadObserverPtr reset_on_load_observer,
+      prefs::mojom::TrackedPreferenceValidationDelegatePtr validation_delegate);
 
   const base::FilePath profile_path_;
   std::vector<prefs::mojom::TrackedPreferenceMetadataPtr>
       tracking_configuration_;
   const size_t reporting_ids_count_;
   const std::string seed_;
   const std::string legacy_device_id_;
-  PrefService* local_state_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfilePrefStoreManager);
 };
 
 #endif  // CHROME_BROWSER_PREFS_PROFILE_PREF_STORE_MANAGER_H_