Avoid IPC message creation between URLLoaderClientImpl and ResourceDispatcher

content/child/url_loader_client_impl.h

 // Copyright 2016 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 CONTENT_CHILD_URL_LOADER_CLIENT_IMPL_H_
 #define CONTENT_CHILD_URL_LOADER_CLIENT_IMPL_H_
 
 #include <stdint.h>
 #include <vector>
 #include "base/callback_forward.h"
@@ skipping 47 matching lines @@
   void OnUploadProgress(int64_t current_position,
                         int64_t total_size,
                         const base::Closure& ack_callback) override;
   void OnReceiveCachedMetadata(const std::vector<uint8_t>& data) override;
   void OnTransferSizeUpdated(int32_t transfer_size_diff) override;
   void OnStartLoadingResponseBody(
       mojo::ScopedDataPipeConsumerHandle body) override;
   void OnComplete(const ResourceRequestCompletionStatus& status) override;
 
  private:
-  void Dispatch(const IPC::Message& message);
+  bool NeedsStoringMessage() const;
+  void StoreAndDispatch(const IPC::Message& message);
 
   mojo::Binding<mojom::URLLoaderClient> binding_;
   scoped_refptr<URLResponseBodyConsumer> body_consumer_;
   mojom::DownloadedTempFilePtr downloaded_file_;
   std::vector<IPC::Message> deferred_messages_;
   const int request_id_;
   bool has_received_response_ = false;
   bool is_deferred_ = false;
   int32_t accumulated_transfer_size_diff_during_deferred_ = 0;
   ResourceDispatcher* const resource_dispatcher_;
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   base::WeakPtrFactory<URLLoaderClientImpl> weak_factory_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_URL_LOADER_CLIENT_IMPL_H_