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

chrome/browser/renderer_host/media_resource_handler.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.
+
+#ifndef CHROME_BROWSER_RENDERER_HOST_MEDIA_RESOURCE_HANDLER_H_
+#define CHROME_BROWSER_RENDERER_HOST_MEDIA_RESOURCE_HANDLER_H_
+
+#include "base/process.h"
+#include "base/platform_file.h"
+#include "chrome/browser/renderer_host/resource_dispatcher_host.h"
+#include "chrome/browser/renderer_host/resource_handler.h"
+
+// Used to complete a media resource request in response to resource load events
+// from the resource dispatcher host. This handler only works asynchronously and
+// tries to work with file for response data if possible. If a response data
+// file is not available, it redirects calls to underlying handler.
+class MediaResourceHandler : public ResourceHandler {
+ public:
+  MediaResourceHandler(ResourceHandler* resource_handler,
+                       ResourceDispatcherHost::Receiver* receiver,
+                       int render_process_host_id,
+                       int routing_id,
+                       base::ProcessHandle render_process,
+                       ResourceDispatcherHost* resource_dispatcher_host);
+
+  // ResourceHandler implementation:
+  bool OnUploadProgress(int request_id, uint64 position, uint64 size);
+  bool OnRequestRedirected(int request_id, const GURL& new_url);
+  bool OnResponseStarted(int request_id, ResourceResponse* response);
+  bool OnWillRead(int request_id, net::IOBuffer** buf, int* buf_size,
+                  int min_size);
+  bool OnReadCompleted(int request_id, int* bytes_read);
+  bool OnResponseCompleted(int request_id, const URLRequestStatus& status,
+                           const std::string& security_info);
+
+ private:
+  ResourceDispatcherHost::Receiver* receiver_;
+  int render_process_host_id_;
+  int routing_id_;
+  base::ProcessHandle render_process_;
+  scoped_refptr<ResourceHandler> handler_;
+  ResourceDispatcherHost* rdh_;
+  bool has_file_handle_;
+  int64 position_;
+  int64 size_;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaResourceHandler);
+};
+
+#endif  // CHROME_BROWSER_RENDERER_HOST_MEDIA_RESOURCE_HANDLER_H_