Refactor the guts of ResourceDispatcherHostImpl into a new class named

content/browser/renderer_host/async_resource_handler.cc

 // Copyright (c) 2012 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.
 
 #include "content/browser/renderer_host/async_resource_handler.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/debug/alias.h"
@@ skipping 189 matching lines @@
     return true;
   DCHECK(read_buffer_.get());
 
   if (read_buffer_->buffer_size() == *bytes_read) {
     // The network layer has saturated our buffer. Next time, we should give it
     // a bigger buffer for it to fill, to minimize the number of round trips we
     // do with the renderer process.
     next_buffer_size_ = std::min(next_buffer_size_ * 2, kMaxReadBufSize);
   }
 
-  if (!rdh_->WillSendData(filter_->child_id(), request_id)) {
+  if (!rdh_->WillSendData(filter_->child_id(), request_id, defer)) {
     // We should not send this data now, we have too many pending requests.
     return true;
   }
 
   base::SharedMemoryHandle handle;
   if (!read_buffer_->shared_memory()->GiveToProcess(
           filter_->peer_handle(), &handle)) {
     // We wrongfully incremented the pending data count. Fake an ACK message
     // to fix this. We can't move this call above the WillSendData because
     // it's killing our read_buffer_, and we don't want that when we pause
@@ skipping 56 matching lines @@
 void AsyncResourceHandler::GlobalCleanup() {
   if (g_spare_read_buffer) {
     // Avoid the CHECK in SharedIOBuffer::~SharedIOBuffer().
     SharedIOBuffer* tmp = g_spare_read_buffer;
     g_spare_read_buffer = NULL;
     tmp->Release();
   }
 }
 
 }  // namespace content