Teach navigation throttles how to cancel requests in WillProcessResponse.

content/browser/frame_host/navigation_request.h

 // Copyright 2014 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_BROWSER_FRAME_HOST_NAVIGATION_REQUEST_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATION_REQUEST_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 143 matching lines @@
       const scoped_refptr<ResourceResponse>& response) override;
   void OnResponseStarted(const scoped_refptr<ResourceResponse>& response,
                          scoped_ptr<StreamHandle> body) override;
   void OnRequestFailed(bool has_stale_copy_in_cache, int net_error) override;
   void OnRequestStarted(base::TimeTicks timestamp) override;
 
   // Called when the NavigationThrottles have been checked by the
   // NavigationHandle.
   void OnStartChecksComplete(NavigationThrottle::ThrottleCheckResult result);
   void OnRedirectChecksComplete(NavigationThrottle::ThrottleCheckResult result);
+  void OnResponseChecksComplete(NavigationThrottle::ThrottleCheckResult result);

[clamy, 2016/01/25 16:36:21]

Let's remove the PlzNavigate changes since I'll be working on those.
NavigationRequest is a PlzNavigate specific file, so it should not be modified.

[Mike West, 2016/01/26 09:41:41]

Done.

 
   // Called when the navigation is about to be sent to the IO thread.
   void InitializeServiceWorkerHandleIfNeeded();
 
   FrameTreeNode* frame_tree_node_;
 
   // Initialized on creation of the NavigationRequest. Sent to the renderer when
   // the navigation is ready to commit.
   // Note: When the navigation is ready to commit, the url in |common_params|
   // will be set to the final navigation url, obtained after following all
   // redirects.
   // Note: |common_params_| and |begin_params_| are not const as they can be
   // modified during redirects.
   // Note: |request_params_| is not const because service_worker_provider_id
   // and should_create_service_worker will be set in OnResponseStarted.
   CommonNavigationParams common_params_;
   BeginNavigationParams begin_params_;
   RequestNavigationParams request_params_;
   const bool browser_initiated_;
 
   NavigationState state_;
 
+  // Used to store response information during throttle checks in
+  // OnResponseStarted.
+  scoped_refptr<ResourceResponse> response_;
+  scoped_ptr<StreamHandle> body_;
 
   // The parameters to send to the IO thread. |loader_| takes ownership of
   // |info_| after calling BeginNavigation.
   scoped_ptr<NavigationRequestInfo> info_;
 
   scoped_ptr<NavigationURLLoader> loader_;
 
   // These next items are used in browser-initiated navigations to store
   // information from the NavigationEntryImpl that is required after request
   // creation time.
   scoped_refptr<SiteInstanceImpl> source_site_instance_;
   scoped_refptr<SiteInstanceImpl> dest_site_instance_;
   NavigationEntryImpl::RestoreType restore_type_;
   bool is_view_source_;
   int bindings_;
 
   scoped_ptr<NavigationHandleImpl> navigation_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationRequest);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATION_REQUEST_H_