[Sync] Notify invalidation handlers when sync is disabled/enabled

chrome/browser/sync/profile_sync_service.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_SYNC_PROFILE_SYNC_SERVICE_H_
 #define CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 
 #include <list>
 #include <string>
 
@@ skipping 697 matching lines @@
   void RefreshSpareBootstrapToken(const std::string& passphrase);
 #endif
 
   // Internal unrecoverable error handler. Used to track error reason via
   // Sync.UnrecoverableErrors histogram.
   void OnInternalUnrecoverableError(const tracked_objects::Location& from_here,
                                     const std::string& message,
                                     bool delete_sync_database,
                                     UnrecoverableErrorReason reason);
 
+  // Must be called every time |backend_initialized_| or
+  // |invalidator_state_| is changed (but only if
+  // |invalidator_registrar_| is not NULL).
+  void UpdateInvalidatorRegistrarState();
+
   // Destroys / recreates an instance of ProfileSyncService. Used exclusively by
   // the sync integration tests so they can restart sync from scratch without
   // tearing down and recreating the browser process. Needed because simply
   // calling Shutdown() and Initialize() will not recreate other internal
   // objects like SyncBackendHost, SyncManager, etc.
   void ResetForTest();
 
   // Factory used to create various dependent objects.
   scoped_ptr<ProfileSyncComponentsFactory> factory_;
 
@@ skipping 108 matching lines @@
   // If |true|, there is setup UI visible so we should not start downloading
   // data types.
   bool setup_in_progress_;
 
   // The set of currently enabled sync experiments.
   syncer::Experiments current_experiments;
 
   // Factory the backend will use to build the SyncManager.
   syncer::SyncManagerFactory sync_manager_factory_;
 
+  // Holds the current invalidator state as updated by
+  // OnInvalidatorStateChange().  Note that this is different from the
+  // state known by |invalidator_registrar_| (See
+  // UpdateInvalidatorState()).
+  syncer::InvalidatorState invalidator_state_;
+
   // Dispatches invalidations to handlers.  Set in Initialize() and
   // unset in Shutdown().
   scoped_ptr<syncer::InvalidatorRegistrar> invalidator_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncService);
 };
 
 bool ShouldShowActionOnUI(
     const syncer::SyncProtocolError& error);
 
 
 #endif  // CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_