Reland: [Sync] Record sync memory usage in histogram broken by datatypes

components/sync/driver/proxy_data_type_controller.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 COMPONENTS_SYNC_DRIVER_PROXY_DATA_TYPE_CONTROLLER_H__
 #define COMPONENTS_SYNC_DRIVER_PROXY_DATA_TYPE_CONTROLLER_H__
 
 #include <memory>
 #include <string>
 
@@ skipping 17 matching lines @@
   void RegisterWithBackend(base::Callback<void(bool)> set_downloaded,
                            ModelTypeConfigurer* configurer) override;
   void StartAssociating(const StartCallback& start_callback) override;
   void Stop() override;
   std::string name() const override;
   State state() const override;
   void ActivateDataType(ModelTypeConfigurer* configurer) override;
   void DeactivateDataType(ModelTypeConfigurer* configurer) override;
   void GetAllNodes(const AllNodesCallback& callback) override;
   void GetStatusCounters(const StatusCountersCallback& callback) override;
+  void RecordMemoryUsageHistogram() override;
 
  private:
   State state_;
 
   DISALLOW_COPY_AND_ASSIGN(ProxyDataTypeController);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_DRIVER_PROXY_DATA_TYPE_CONTROLLER_H__