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diff --git a/chrome/browser/renderer_host/async_resource_handler.h b/chrome/browser/renderer_host/async_resource_handler.h
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+++ b/chrome/browser/renderer_host/async_resource_handler.h
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+// 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_ASYNC_RESOURCE_HANDLER_H_
+#define CHROME_BROWSER_RENDERER_HOST_ASYNC_RESOURCE_HANDLER_H_
+
+#include "chrome/browser/renderer_host/resource_dispatcher_host.h"
+#include "chrome/browser/renderer_host/resource_handler.h"
+
+class base::SharedMemory;
+
+// Used to complete an asynchronous resource request in response to resource
+// load events from the resource dispatcher host.
+class AsyncResourceHandler : public ResourceHandler {
+ public:
+  AsyncResourceHandler(ResourceDispatcherHost::Receiver* receiver,
+                       int render_process_host_id,
+                       int routing_id,
+                       HANDLE render_process,
+                       const GURL& url,
+                       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, char** buf, int* buf_size, int min_size);
+  bool OnReadCompleted(int request_id, int* bytes_read);
+  bool OnResponseCompleted(int request_id, const URLRequestStatus& status);
+
+  static void GlobalCleanup();
+
+ private:
+  // When reading, we don't know if we are going to get EOF (0 bytes read), so
+  // we typically have a buffer that we allocated but did not use.  We keep
+  // this buffer around for the next read as a small optimization.
+  static base::SharedMemory* spare_read_buffer_;
+
+  scoped_ptr<base::SharedMemory> read_buffer_;
+  ResourceDispatcherHost::Receiver* receiver_;
+  int render_process_host_id_;
+  int routing_id_;
+  HANDLE render_process_;
+  ResourceDispatcherHost* rdh_;
+
+  DISALLOW_COPY_AND_ASSIGN(AsyncResourceHandler);
+};
+
+#endif  // CHROME_BROWSER_RENDERER_HOST_ASYNC_RESOURCE_HANDLER_H_