Make WebURLLoader capable of retaining received buffers.

content/child/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_CHILD_RESOURCE_DISPATCHER_H_
 #define CONTENT_CHILD_RESOURCE_DISPATCHER_H_
 
 #include <deque>
 #include <string>
 
 #include "base/containers/hash_tables.h"
 #include "base/memory/linked_ptr.h"
+#include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/shared_memory.h"
 #include "base/memory/weak_ptr.h"
 #include "base/single_thread_task_runner.h"
 #include "base/time/time.h"
 #include "content/common/content_export.h"
 #include "content/public/common/resource_type.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_sender.h"
 #include "net/base/request_priority.h"
 #include "url/gurl.h"
 
 struct ResourceHostMsg_Request;
 struct ResourceMsg_RequestCompleteData;
 
 namespace blink {
 class WebThreadedDataReceiver;
 }
 
 namespace net {
 struct RedirectInfo;
 }
 
 namespace content {
+class RefCountedSharedMemory;
 class RequestPeer;
 class ResourceDispatcherDelegate;
 class ResourceRequestBody;
 class ThreadedDataProvider;
 struct ResourceResponseInfo;
 struct RequestInfo;
 struct ResourceResponseHead;
 struct SiteIsolationResponseMetaData;
 struct SyncLoadResponse;
 
@@ skipping 108 matching lines @@
     GURL url;
     // The security origin of the frame that initiates this request.
     GURL frame_origin;
     // The url of the latest response even in case of redirection.
     GURL response_url;
     bool download_to_file;
     linked_ptr<IPC::Message> pending_redirect_message;
     base::TimeTicks request_start;
     base::TimeTicks response_start;
     base::TimeTicks completion_time;
-    linked_ptr<base::SharedMemory> buffer;
+    scoped_refptr<RefCountedSharedMemory> buffer;
     linked_ptr<SiteIsolationResponseMetaData> site_isolation_metadata;
     bool blocked_response;
     int buffer_size;
   };
   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);
 
@@ skipping 72 matching lines @@
   scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
 
   base::WeakPtrFactory<ResourceDispatcher> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceDispatcher);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_RESOURCE_DISPATCHER_H_