[Sync] Add keystore encryption info to about:sync

sync/internal_api/sync_encryption_handler_impl.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 SYNC_INTERNAL_API_SYNC_ENCRYPTION_HANDLER_IMPL_H_
 #define SYNC_INTERNAL_API_SYNC_ENCRYPTION_HANDLER_IMPL_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
+#include "base/time.h"
 #include "base/threading/thread_checker.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "sync/internal_api/public/sync_encryption_handler.h"
 #include "sync/syncable/nigori_handler.h"
 #include "sync/util/cryptographer.h"
 
 namespace syncer {
 
@@ skipping 33 matching lines @@
   virtual void AddObserver(Observer* observer) OVERRIDE;
   virtual void RemoveObserver(Observer* observer) OVERRIDE;
   virtual void Init() OVERRIDE;
   virtual void SetEncryptionPassphrase(const std::string& passphrase,
                                        bool is_explicit) OVERRIDE;
   virtual void SetDecryptionPassphrase(const std::string& passphrase) OVERRIDE;
   virtual void EnableEncryptEverything() OVERRIDE;
   virtual bool EncryptEverythingEnabled() const OVERRIDE;
   virtual PassphraseType GetPassphraseType() const OVERRIDE;
 
-  // TODO(zea): provide a method for getting the time at which the nigori
-  // node was migrated.
-
   // NigoriHandler implementation.
   // Note: all methods are invoked while the caller holds a transaction.
   virtual void ApplyNigoriUpdate(
       const sync_pb::NigoriSpecifics& nigori,
       syncable::BaseTransaction* const trans) OVERRIDE;
   virtual void UpdateNigoriFromEncryptedTypes(
       sync_pb::NigoriSpecifics* nigori,
       syncable::BaseTransaction* const trans) const OVERRIDE;
   virtual bool NeedKeystoreKey(
       syncable::BaseTransaction* const trans) const OVERRIDE;
   virtual bool SetKeystoreKey(
       const std::string& key,
       syncable::BaseTransaction* const trans) OVERRIDE;
   // Can be called from any thread.
   virtual ModelTypeSet GetEncryptedTypes(
       syncable::BaseTransaction* const trans) const OVERRIDE;
 
   // Unsafe getters. Use only if sync is not up and running and there is no risk
   // of other threads calling this.
   Cryptographer* GetCryptographerUnsafe();
   ModelTypeSet GetEncryptedTypesUnsafe();
 
   bool MigratedToKeystore();
+  base::Time migration_time() const;
 
  private:
   FRIEND_TEST_ALL_PREFIXES(SyncEncryptionHandlerImplTest,
                            NigoriEncryptionTypes);
   FRIEND_TEST_ALL_PREFIXES(SyncEncryptionHandlerImplTest,
                            EncryptEverythingExplicit);
   FRIEND_TEST_ALL_PREFIXES(SyncEncryptionHandlerImplTest,
                            EncryptEverythingImplicit);
   FRIEND_TEST_ALL_PREFIXES(SyncEncryptionHandlerImplTest,
                            UnknownSensitiveTypes);
@@ skipping 179 matching lines @@
   PassphraseType passphrase_type_;
 
   // The keystore key provided by the server.
   std::string keystore_key_;
 
   // The number of times we've automatically (i.e. not via SetPassphrase or
   // conflict resolver) updated the nigori's encryption keys in this chrome
   // instantiation.
   int nigori_overwrite_count_;
 
-  // The time (in ms) the nigori was migrated to support keystore encryption.
-  int64 migration_time_ms_;
+  // The time the nigori was migrated to support keystore encryption.
+  base::Time migration_time_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncEncryptionHandlerImpl);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_SYNC_ENCRYPTION_HANDLER_IMPL_H_