[Sync] Implement EstimateMemoryUsage for SharedModelTypeProcessor and ModelTypeWorker

components/sync/model_impl/shared_model_type_processor.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_MODEL_IMPL_SHARED_MODEL_TYPE_PROCESSOR_H_
 #define COMPONENTS_SYNC_MODEL_IMPL_SHARED_MODEL_TYPE_PROCESSOR_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 56 matching lines @@
                    const std::string& message) override;
 
   // ModelTypeProcessor implementation.
   void ConnectSync(std::unique_ptr<CommitQueue> worker) override;
   void DisconnectSync() override;
   void OnCommitCompleted(const sync_pb::ModelTypeState& type_state,
                          const CommitResponseDataList& response_list) override;
   void OnUpdateReceived(const sync_pb::ModelTypeState& type_state,
                         const UpdateResponseDataList& updates) override;
 
+  // Returns the estimate of dynamically allocated memory in bytes.
+  size_t EstimateMemoryUsage() const;
+
  private:
   friend class ModelTypeDebugInfo;
   friend class SharedModelTypeProcessorTest;
 
   // Returns true if the model is ready or encountered an error.
   bool IsModelReadyOrError() const;
 
   // If preconditions are met, inform sync that we are ready to connect.
   void ConnectIfReady();
 
@@ skipping 120 matching lines @@
 
   // WeakPtrFactory for this processor which will be sent to sync thread.
   base::WeakPtrFactory<SharedModelTypeProcessor> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SharedModelTypeProcessor);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_MODEL_IMPL_SHARED_MODEL_TYPE_PROCESSOR_H_