Offload disk accesses to WorkerPool in ExtensionProtocolHandler

net/url_request/url_request_data_job.h

 // Copyright (c) 2011 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 NET_URL_REQUEST_URL_REQUEST_DATA_JOB_H_
 #define NET_URL_REQUEST_URL_REQUEST_DATA_JOB_H_
 
 #include <string>
 
 #include "net/url_request/url_request.h"
 #include "net/url_request/url_request_simple_job.h"
 
 namespace net {
 
 class URLRequest;
 
 class URLRequestDataJob : public URLRequestSimpleJob {
  public:
   explicit URLRequestDataJob(URLRequest* request);
 
   static URLRequest::ProtocolFactory Factory;
 
   // URLRequestSimpleJob
-  virtual bool GetData(std::string* mime_type,
-                       std::string* charset,
-                       std::string* data) const OVERRIDE;
+  virtual int GetData(std::string* mime_type,
+                      std::string* charset,
+                      std::string* data,
+                      const CompletionCallback& callback) const OVERRIDE;
 
  private:
   virtual ~URLRequestDataJob();
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestDataJob);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_DATA_JOB_H_