[Sync] Add histograms for cookie jar state on Sessions commit

components/sync_driver/glue/sync_backend_host_impl.h

 // Copyright 2013 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 COMPONENTS_SYNC_DRIVER_GLUE_SYNC_BACKEND_HOST_IMPL_H_
 #define COMPONENTS_SYNC_DRIVER_GLUE_SYNC_BACKEND_HOST_IMPL_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 129 matching lines @@
   void EnableDirectoryTypeDebugInfoForwarding() override;
   void DisableDirectoryTypeDebugInfoForwarding() override;
   void GetAllNodesForTypes(
       syncer::ModelTypeSet types,
       base::Callback<void(const std::vector<syncer::ModelType>&,
                           ScopedVector<base::ListValue>)> type) override;
   base::MessageLoop* GetSyncLoopForTesting() override;
   void RefreshTypesForTest(syncer::ModelTypeSet types) override;
   void ClearServerData(
       const syncer::SyncManager::ClearServerDataCallback& callback) override;
-  void OnCookieJarChanged(bool account_mismatch) override;
+  void OnCookieJarChanged(bool account_mismatch, bool empty_jar) override;
 
   // InvalidationHandler implementation.
   void OnInvalidatorStateChange(syncer::InvalidatorState state) override;
   void OnIncomingInvalidation(
       const syncer::ObjectIdInvalidationMap& invalidation_map) override;
   std::string GetOwnerName() const override;
 
  protected:
   // The types and functions below are protected so that test
   // subclasses can use them.
@@ skipping 214 matching lines @@
   bool invalidation_handler_registered_;
 
   base::WeakPtrFactory<SyncBackendHostImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncBackendHostImpl);
 };
 
 }  // namespace browser_sync
 
 #endif  // COMPONENTS_SYNC_DRIVER_GLUE_SYNC_BACKEND_HOST_IMPL_H_