IPC messages and changes to ResourceLoaderBridge to support resource loading for media

chrome/browser/renderer_host/resource_dispatcher_host.h

 // Copyright (c) 2006-2008 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.
 
 // This is the browser side of the resource dispatcher, it receives requests
 // from the child process (i.e. [Renderer, Plugin, Worker]ProcessHost), and
 // dispatches them to URLRequests. It then fowards the messages from the
 // URLRequests back to the correct process for handling.
 //
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
@@ skipping 219 matching lines @@
   // renderer in the event of a download.
   void CancelRequest(int process_id,
                      int request_id,
                      bool from_renderer);
 
   // Decrements the pending_data_count for the request and resumes
   // the request if it was paused due to too many pending data
   // messages sent.
   void OnDataReceivedACK(int process_id, int request_id);
 
+  // Called when the renderer process confirms the reception of a download
+  // progress message.
+  void OnDownloadProgressACK(int process_id, int request_id);
+
   // Resets the waiting_for_upload_progress_ack flag.
   void OnUploadProgressACK(int process_id, int request_id);
 
   // Returns true if it's ok to send the data. If there are already too many
   // data messages pending, it pauses the request and returns false. In this
   // case the caller should not send the data.
   bool WillSendData(int process_id, int request_id);
 
   // Pauses or resumes network activity for a particular request.
   void PauseRequest(int process_id, int request_id, bool pause);
@@ skipping 271 matching lines @@
   // individual requests is given by CalculateApproximateMemoryCost).
   // The total number of outstanding requests is roughly:
   //   (max_outstanding_requests_cost_per_process_ /
   //       kAvgBytesPerOutstandingRequest)
   int max_outstanding_requests_cost_per_process_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceDispatcherHost);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RESOURCE_DISPATCHER_HOST_H_