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

chrome/browser/renderer_host/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.
 
 // This is the browser side of the resource dispatcher, it receives requests
 // from the RenderProcessHosts, 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
 
 #ifndef CHROME_BROWSER_RENDERER_HOST_RESOURCE_HANDLER_H_
 #define CHROME_BROWSER_RENDERER_HOST_RESOURCE_HANDLER_H_
 
 #include <string>
 
+#include "build/build_config.h"
+#if defined(OS_POSIX)
+#include "base/file_descriptor_posix.h"
+#endif
+#include "base/platform_file.h"
 #include "chrome/common/filter_policy.h"
 #include "net/url_request/url_request_status.h"
 #include "webkit/glue/resource_loader_bridge.h"
 
 namespace net {
 class IOBuffer;
 }
 
 // Parameters for a resource response header.
 struct ResourceResponseHead
     : webkit_glue::ResourceLoaderBridge::ResponseInfo {
   // The response status.
   URLRequestStatus status;
 
   // Specifies if the resource should be filtered before being displayed
   // (insecure resources can be filtered to keep the page secure).
   FilterPolicy::Type filter_policy;
+
+  // A platform specific handle for a file that carries response data. This
+  // entry is used if the resource request is of type ResourceType::MEDIA and
+  // the underlying cache layer keeps the response data in a standalone file.
+#if defined(OS_POSIX)
+  // If the response data file is available, the file handle is stored in
+  // response_data_file.fd, its value is base::kInvalidPlatformFileValue
+  // otherwise.
+  base::FileDescriptor response_data_file;
+#elif defined(OS_WIN)
+  // An asynchronous file handle to the response data file, its value is
+  // base::kInvalidPlatformFileValue if the file is not available.
+  base::PlatformFile response_data_file;
+#endif
 };
 
 // Parameters for a synchronous resource response.
 struct SyncLoadResult : ResourceResponseHead {
   // The final URL after any redirects.
   GURL final_url;
 
   // The response data.
   std::string data;
 };
@@ skipping 39 matching lines @@
   virtual bool OnReadCompleted(int request_id, int* bytes_read) = 0;
 
   // The response is complete.  The final response status is given.
   // Returns false if the handler is deferring the call to a later time.
   virtual bool OnResponseCompleted(int request_id,
                                    const URLRequestStatus& status,
                                    const std::string& security_info) = 0;
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RESOURCE_HANDLER_H_