Navigation transitions: Block first response until after transitions have run.

content/browser/loader/cross_site_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.
 
 #ifndef CONTENT_BROWSER_LOADER_CROSS_SITE_RESOURCE_HANDLER_H_
 #define CONTENT_BROWSER_LOADER_CROSS_SITE_RESOURCE_HANDLER_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "content/browser/loader/layered_resource_handler.h"
@@ skipping 35 matching lines @@
 
   // We can now send the response to the new renderer, which will cause
   // WebContentsImpl to swap in the new renderer and destroy the old one.
   void ResumeResponse();
 
   // When set to true, requests are leaked when they can't be passed to a
   // RenderViewHost, for unit tests.
   CONTENT_EXPORT static void SetLeakRequestsForTesting(
       bool leak_requests_for_testing);
 
+  // Navigations are deferred at OnResponseStarted to parse out any navigation
+  // transition link headers, and give the navigation transition (if it exists)
+  // a chance to run.
+  void ResumeResponseDeferredAtStart(int request_id);
+
  private:
   // Prepare to render the cross-site response in a new RenderViewHost, by
   // telling the old RenderViewHost to run its onunload handler.
   void StartCrossSiteTransition(int request_id,
                                 ResourceResponse* response,
                                 bool should_transfer);
 
   // Defer the navigation to the UI thread to check whether transfer is required
   // or not. Currently only used in --site-per-process.
   bool DeferForNavigationPolicyCheck(ResourceRequestInfoImpl* info,
                                      ResourceResponse* response,
                                      bool* defer);
 
+  bool OnNavigationTransitionResponseStarted(int request_id,
+                                             ResourceResponse* response,
+                                             bool* defer);
+
+  bool OnNormalResponseStarted(int request_id,
+                               ResourceResponse* response,
+                               bool* defer);
+
   void ResumeOrTransfer(bool is_transfer);
   void ResumeIfDeferred();
 
   // Called when about to defer a request.  Sets |did_defer_| and logs the
   // defferral
   void OnDidDefer();
 
   bool has_started_response_;
   bool in_cross_site_transition_;
   bool completed_during_transition_;
   bool did_defer_;
   net::URLRequestStatus completed_status_;
   std::string completed_security_info_;
   scoped_refptr<ResourceResponse> response_;
 
   // TODO(nasko): WeakPtr is needed in --site-per-process, since all navigations
   // are deferred to the UI thread and come back to IO thread via
   // PostTaskAndReplyWithResult. If a transfer is needed, it goes back to the UI
   // thread. This can be removed once the code is changed to only do one hop.
   base::WeakPtrFactory<CrossSiteResourceHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CrossSiteResourceHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_CROSS_SITE_RESOURCE_HANDLER_H_