Move MimeTypeResourceHandler before ThrottlingResourceHandler

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 "content/common/content_export.h"
+
 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 {
+class CONTENT_EXPORT ResourceThrottle {
  public:
   virtual ~ResourceThrottle() {}
 
   // Called before the resource request is started.
   virtual void WillStartRequest(bool* defer) {}
 
   // Called when the request was redirected.  |redirect_info| contains the
   // redirect responses's HTTP status code and some information about the new
   // request that will be sent if the redirect is followed, including the new
   // URL and new method.
   virtual void WillRedirectRequest(const net::RedirectInfo& redirect_info,
                                    bool* defer) {}
 
   // Called when the response headers and meta data are available.
   virtual void WillProcessResponse(bool* defer) {}
 
   // Returns the name of the throttle, as a UTF-8 C-string, for logging
   // purposes.  nullptr is not allowed.  Caller does *not* take ownership of the
   // returned string.
   virtual const char* GetNameForLogging() const = 0;
 
+  // Whether this ResourceThrottle needs to execute WillProcessResponse before
+  // any part of the response body is read. Normally this is false. This should
+  // be set to true if the ResourceThrottle wants to ensure that no part of the
+  // response body will be cached if the request is canceled in
+  // WillProcessResponse.
+  virtual bool MustProcessResponseBeforeReadingBody();
+
   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_