(Re-)introduce AncestorThrottle to handle 'X-Frame-Options'.

content/browser/frame_host/navigation_handle_impl.cc

 // Copyright 2015 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.
 
 #include "content/browser/frame_host/navigation_handle_impl.h"
 
 #include "base/debug/dump_without_crashing.h"
 #include "base/logging.h"
 #include "content/browser/browsing_data/clear_site_data_throttle.h"
 #include "content/browser/child_process_security_policy_impl.h"
 #include "content/browser/devtools/render_frame_devtools_agent_host.h"
+#include "content/browser/frame_host/ancestor_throttle.h"
 #include "content/browser/frame_host/debug_urls.h"
 #include "content/browser/frame_host/frame_tree_node.h"
 #include "content/browser/frame_host/navigator.h"
 #include "content/browser/frame_host/navigator_delegate.h"
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 #include "content/browser/service_worker/service_worker_context_wrapper.h"
 #include "content/browser/service_worker/service_worker_navigation_handle.h"
 #include "content/common/frame_messages.h"
 #include "content/common/resource_request_body_impl.h"
 #include "content/common/site_isolation_policy.h"
@@ skipping 258 matching lines @@
     if (result == NavigationThrottle::PROCEED && !MaybeTransferAndProceed())
       return;
   }
 
   if (result != NavigationThrottle::DEFER)
     RunCompleteCallback(result);
 }
 
 void NavigationHandleImpl::CancelDeferredNavigation(
     NavigationThrottle::ThrottleCheckResult result) {
-  DCHECK(state_ == DEFERRING_START || state_ == DEFERRING_REDIRECT);
+  DCHECK(state_ == DEFERRING_START ||
+         state_ == DEFERRING_REDIRECT ||
+         state_ == DEFERRING_RESPONSE);
   DCHECK(result == NavigationThrottle::CANCEL_AND_IGNORE ||
          result == NavigationThrottle::CANCEL);
   state_ = CANCELING;
   RunCompleteCallback(result);
 }
 
 void NavigationHandleImpl::RegisterThrottleForTesting(
     std::unique_ptr<NavigationThrottle> navigation_throttle) {
   throttles_.push_back(std::move(navigation_throttle));
 }
@@ skipping 284 matching lines @@
       case NavigationThrottle::CANCEL:
       case NavigationThrottle::CANCEL_AND_IGNORE:
       case NavigationThrottle::BLOCK_REQUEST:
         state_ = CANCELING;
         return result;
 
       case NavigationThrottle::DEFER:
         state_ = DEFERRING_START;
         next_index_ = i + 1;
         return result;
+
+      case NavigationThrottle::BLOCK_RESPONSE:
+        NOTREACHED();
     }
   }
   next_index_ = 0;
   state_ = WILL_SEND_REQUEST;
   return NavigationThrottle::PROCEED;
 }
 
 NavigationThrottle::ThrottleCheckResult
 NavigationHandleImpl::CheckWillRedirectRequest() {
   DCHECK(state_ == WILL_REDIRECT_REQUEST || state_ == DEFERRING_REDIRECT);
@@ skipping 10 matching lines @@
       case NavigationThrottle::CANCEL_AND_IGNORE:
         state_ = CANCELING;
         return result;
 
       case NavigationThrottle::DEFER:
         state_ = DEFERRING_REDIRECT;
         next_index_ = i + 1;
         return result;
 
       case NavigationThrottle::BLOCK_REQUEST:
+      case NavigationThrottle::BLOCK_RESPONSE:
         NOTREACHED();
     }
   }
   next_index_ = 0;
   state_ = WILL_REDIRECT_REQUEST;
 
   // Notify the delegate that a redirect was encountered and will be followed.
   if (GetDelegate())
     GetDelegate()->DidRedirectNavigation(this);
 
   return NavigationThrottle::PROCEED;
 }
 
 NavigationThrottle::ThrottleCheckResult
 NavigationHandleImpl::CheckWillProcessResponse() {
   DCHECK(state_ == WILL_PROCESS_RESPONSE || state_ == DEFERRING_RESPONSE);
   DCHECK(state_ != WILL_PROCESS_RESPONSE || next_index_ == 0);
   DCHECK(state_ != DEFERRING_RESPONSE || next_index_ != 0);
   for (size_t i = next_index_; i < throttles_.size(); ++i) {
     NavigationThrottle::ThrottleCheckResult result =
         throttles_[i]->WillProcessResponse();
     switch (result) {
       case NavigationThrottle::PROCEED:
         continue;
 
       case NavigationThrottle::CANCEL:
       case NavigationThrottle::CANCEL_AND_IGNORE:
+      case NavigationThrottle::BLOCK_RESPONSE:
         state_ = CANCELING;
         return result;
 
       case NavigationThrottle::DEFER:
         state_ = DEFERRING_RESPONSE;
         next_index_ = i + 1;
         return result;
 
       case NavigationThrottle::BLOCK_REQUEST:
         NOTREACHED();
@@ skipping 106 matching lines @@
 
   // No code after running the callback, as it might have resulted in our
   // destruction.
 }
 
 void NavigationHandleImpl::RegisterNavigationThrottles() {
   // Register the navigation throttles. The ScopedVector returned by
   // GetNavigationThrottles is not assigned to throttles_ directly because it
   // would overwrite any throttle previously added with
   // RegisterThrottleForTesting.
+

[clamy, 2016/12/09 17:14:01]

nit: no need for empty line here.

   ScopedVector<NavigationThrottle> throttles_to_register =
       GetDelegate()->CreateThrottlesForNavigation(this);
   std::unique_ptr<NavigationThrottle> devtools_throttle =
       RenderFrameDevToolsAgentHost::CreateThrottleForNavigation(this);
   if (devtools_throttle)
     throttles_to_register.push_back(std::move(devtools_throttle));
 
   std::unique_ptr<NavigationThrottle> clear_site_data_throttle =
       ClearSiteDataThrottle::CreateThrottleForNavigation(this);
   if (clear_site_data_throttle)
     throttles_to_register.push_back(std::move(clear_site_data_throttle));
 
+  std::unique_ptr<content::NavigationThrottle> ancestor_throttle =
+      content::AncestorThrottle::MaybeCreateThrottleFor(this);
+  if (ancestor_throttle)
+    throttles_.push_back(std::move(ancestor_throttle));
+
   if (throttles_to_register.size() > 0) {
     throttles_.insert(throttles_.begin(), throttles_to_register.begin(),
                       throttles_to_register.end());
     throttles_to_register.weak_clear();
   }
 }
 
 }  // namespace content