Move MimeTypeResourceHandler before ThrottlingResourceHandler

content/browser/loader/resource_handler.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.
 
 // 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
@@ skipping 90 matching lines @@
   virtual void OnResponseCompleted(const net::URLRequestStatus& status,
                                    const std::string& security_info,
                                    bool* defer) = 0;
 
   // This notification is synthesized by the RedirectToFileResourceHandler
   // to indicate progress of 'download_to_file' requests. OnReadCompleted
   // calls are consumed by the RedirectToFileResourceHandler and replaced
   // with OnDataDownloaded calls.
   virtual void OnDataDownloaded(int bytes_downloaded) = 0;
 
+  // Whether this ResourceHandler is a leaf handler (ie the last handler in a
+  // chain of handlers).
+  virtual bool IsLeafHandler() const;
+
+  // If this handler points to a leaf handler, replaces it with |new_handler|
+  // while delivering |payload_for_old_handler| and simulating the end of the
+  // request on the former leaf handler.
+  // This should never be called on a leaf handler.
+  virtual void InstallNewLeafHandler(
+      std::unique_ptr<ResourceHandler> new_handler,
+      const std::string& payload_for_old_handler);
+
  protected:
   ResourceHandler(net::URLRequest* request);
 
   ResourceController* controller() const { return controller_; }
   net::URLRequest* request() const { return request_; }
 
   // Convenience functions.
   ResourceRequestInfoImpl* GetRequestInfo() const;
   int GetRequestID() const;
   ResourceMessageFilter* GetFilter() const;
 
  private:
   ResourceController* controller_;
   net::URLRequest* request_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_RESOURCE_HANDLER_H_