Modify AsyncResourceHandler to use a single shared memory buffer (in ring

content/common/resource_dispatcher.h

 // 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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #ifndef CONTENT_COMMON_RESOURCE_DISPATCHER_H_
 #define CONTENT_COMMON_RESOURCE_DISPATCHER_H_
 
 #include <deque>
@@ skipping 71 matching lines @@
 
     webkit_glue::ResourceLoaderBridge::Peer* peer;
     ResourceType::Type resource_type;
     MessageQueue deferred_message_queue;
     bool is_deferred;
     GURL url;
     linked_ptr<IPC::Message> pending_redirect_message;
     base::TimeTicks request_start;
     base::TimeTicks response_start;
     base::TimeTicks completion_time;
+    linked_ptr<base::SharedMemory> buffer;
   };
   typedef base::hash_map<int, PendingRequestInfo> PendingRequestList;
 
   // Helper to lookup the info based on the request_id.
   // May return NULL if the request as been canceled from the client side.
   PendingRequestInfo* GetPendingRequestInfo(int request_id);
 
   // Follows redirect, if any, for the given request.
   void FollowPendingRedirect(int request_id, PendingRequestInfo& request_info);
 
   // Message response handlers, called by the message handler for this process.
   void OnUploadProgress(
       const IPC::Message& message,
       int request_id,
       int64 position,
       int64 size);
   void OnReceivedResponse(int request_id, const ResourceResponseHead&);
   void OnReceivedCachedMetadata(int request_id, const std::vector<char>& data);
   void OnReceivedRedirect(
       const IPC::Message& message,
       int request_id,
       const GURL& new_url,
       const ResourceResponseHead& response_head);
+  void OnSetDataBuffer(
+      const IPC::Message& message,
+      int request_id,
+      base::SharedMemoryHandle shm_handle,
+      int shm_size);
   void OnReceivedData(
       const IPC::Message& message,
       int request_id,
-      base::SharedMemoryHandle data,
-      int data_len,
+      int data_offset,
+      int data_length,
       int encoded_data_length);
   void OnDownloadedData(
       const IPC::Message& message,
       int request_id,
       int data_len);
   void OnRequestComplete(
       int request_id,
       int error_code,
       bool was_ignored_by_handler,
       const std::string& security_info,
@@ skipping 37 matching lines @@
   base::WeakPtrFactory<ResourceDispatcher> weak_factory_;
 
   ResourceDispatcherDelegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceDispatcher);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_RESOURCE_DISPATCHER_H_