Dispatch transfer size update notification on mojo-loading

content/browser/loader/mojo_async_resource_handler.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_BROWSER_LOADER_MOJO_ASYNC_RESOURCE_HANDLER_H_
 #define CONTENT_BROWSER_LOADER_MOJO_ASYNC_RESOURCE_HANDLER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 73 matching lines @@
   // true when done successfully.
   bool CopyReadDataToDataPipe(bool* defer);
   // Allocates a WriterIOBuffer and set it to |*buf|. Returns true when done
   // successfully.
   bool AllocateWriterIOBuffer(scoped_refptr<net::IOBufferWithSize>* buf,
                               bool* defer);
 
   bool CheckForSufficientResource();
   void OnWritable(MojoResult result);
   void Cancel();
+  int64_t CalculateTransferSizeDiff();

[mmenke, 2016/12/13 20:01:25]

Mind adding a description to what this does?  Not clear that it reports extra
bytes read since the last call to this method.

Also maybe rename it.  CalculateRecentlyReceivedBytes?  (Received is clearer
than transfer, recently at least gives some implication that there's a time
window involved, though isn't completely on clear on what that is).  Or
GetBytesReceivedSinceLastCall?

[yhirano, 2016/12/14 16:47:27]

Done.

   // This function can be overriden only for tests.
   virtual void ReportBadMessage(const std::string& error);
 
   void OnTransfer(mojom::URLLoaderAssociatedRequest mojo_request,
                   mojom::URLLoaderClientAssociatedPtr url_loader_client);
 
   ResourceDispatcherHostImpl* rdh_;
   mojo::AssociatedBinding<mojom::URLLoader> binding_;
 
   bool has_checked_for_sufficient_resources_ = false;
@@ skipping 12 matching lines @@
   size_t buffer_bytes_read_ = 0;
   scoped_refptr<SharedWriter> shared_writer_;
 
   base::WeakPtrFactory<MojoAsyncResourceHandler> weak_factory_;
   DISALLOW_COPY_AND_ASSIGN(MojoAsyncResourceHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_MOJO_ASYNC_RESOURCE_HANDLER_H_