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

components/sync/driver/directory_data_type_controller.h

 // Copyright 2015 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_DIRECTORY_DATA_TYPE_CONTROLLER_H__
 #define COMPONENTS_SYNC_DRIVER_DIRECTORY_DATA_TYPE_CONTROLLER_H__
 
 #include <memory>
 
 #include "components/sync/driver/data_type_controller.h"
@@ skipping 31 matching lines @@
   void ActivateDataType(ModelTypeConfigurer* configurer) override;
 
   // Directory specific implementation of DeactivateDataType.
   // Deactivates change processing on the controlled data type (by removing
   // the data type's ChangeProcessor registration with the backend).
   // See ModelTypeConfigurer::DeactivateDataType for more details.
   void DeactivateDataType(ModelTypeConfigurer* configurer) override;
 
   void GetAllNodes(const AllNodesCallback& callback) override;
   void GetStatusCounters(const StatusCountersCallback& callback) override;
+  void RecordMemoryUsageHistogram() override;
 
   // Returns a ListValue representing all nodes for a specified type by querying
   // the directory.
   static std::unique_ptr<base::ListValue> GetAllNodesForTypeFromDirectory(
       ModelType type,
       syncable::Directory* directory);
 
  protected:
   // |dump_stack| is called when an unrecoverable error occurs.
   DirectoryDataTypeController(ModelType type,
@@ skipping 16 matching lines @@
  private:
   // The model safe group of this data type.  This should reflect the
   // thread that should be used to modify the data type's native
   // model.
   ModelSafeGroup model_safe_group_;
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_DRIVER_DIRECTORY_DATA_TYPE_CONTROLLER_H__