content::ResourceDispatcherHostImpl changes for stale-while-revalidate

content/public/browser/resource_throttle.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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_RESOURCE_THROTTLE_H_
 #define CONTENT_PUBLIC_BROWSER_RESOURCE_THROTTLE_H_
 
-#include <vector>
-
-class GURL;
-
 namespace net {
 struct RedirectInfo;
 }
 
 namespace content {
 
+class AsyncRevalidationDriver;
 class ResourceController;
+class ThrottlingResourceHandler;
 
 // A ResourceThrottle gets notified at various points during the process of
 // loading a resource.  At each stage, it has the opportunity to defer the
 // resource load.  The ResourceController interface may be used to resume a
 // deferred resource load, or it may be used to cancel a resource load at any
 // time.
 class ResourceThrottle {
  public:
   virtual ~ResourceThrottle() {}
 
@@ skipping 20 matching lines @@
 
   void set_controller_for_testing(ResourceController* c) {
     controller_ = c;
   }
 
  protected:
   ResourceThrottle() : controller_(nullptr) {}
   ResourceController* controller() { return controller_; }
 
  private:
+  friend class AsyncRevalidationDriver;
   friend class ThrottlingResourceHandler;
   void set_controller(ResourceController* c) { controller_ = c; }
 
   ResourceController* controller_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_RESOURCE_THROTTLE_H_