WIP: Move 'X-Frame-Options' checking to the browser.

content/browser/frame_host/navigation_handle_impl.cc

Index: content/browser/frame_host/navigation_handle_impl.cc
diff --git a/content/browser/frame_host/navigation_handle_impl.cc b/content/browser/frame_host/navigation_handle_impl.cc
index 743d2ead8e6d5ef85eb18bf6f1012a3839890b4d..87000a577569a6116350739b6afd815a06802140 100644
--- a/content/browser/frame_host/navigation_handle_impl.cc
+++ b/content/browser/frame_host/navigation_handle_impl.cc
@@ -9,6 +9,7 @@
 #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/frame_host/xfo_throttle.h"
 #include "content/browser/service_worker/service_worker_context_wrapper.h"
 #include "content/browser/service_worker/service_worker_navigation_handle.h"
 #include "content/public/browser/content_browser_client.h"
@@ -231,10 +232,15 @@ void NavigationHandleImpl::WillStartRequest(
   state_ = WILL_SEND_REQUEST;
   complete_callback_ = callback;
 
-  // 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.
+  // Register the platform's navigation throttles.
+  //
+  // TODO(mkwst): Add support for CSP's 'frame-ancestors'.
+  if (scoped_ptr<content::NavigationThrottle> xfo_throttle =
+          XFOThrottle::MaybeCreateThrottleFor(this)) {
+    throttles_.push_back(std::move(xfo_throttle));
+  }
+
+  // Register the embedder's navigation throttles.
   ScopedVector<NavigationThrottle> throttles_to_register =
       GetContentClient()->browser()->CreateThrottlesForNavigation(this);
   if (throttles_to_register.size() > 0) {
@@ -282,6 +288,24 @@ void NavigationHandleImpl::DidRedirectNavigation(const GURL& new_url) {
   GetDelegate()->DidRedirectNavigation(this);
 }
 
+void NavigationHandleImpl::WillProcessResponse(
+    RenderFrameHostImpl* render_frame_host,
+    scoped_refptr<net::HttpResponseHeaders> response_headers,
+    const ThrottleChecksFinishedCallback& callback) {
+  DCHECK(!render_frame_host_ || render_frame_host_ == render_frame_host);
+  render_frame_host_ = render_frame_host;
+  response_headers_ = response_headers;
+  state_ = READY_TO_COMMIT;
+  complete_callback_ = callback;
+
+  NavigationThrottle::ThrottleCheckResult result = CheckWillProcessResponse();
+  DCHECK(result != NavigationThrottle::DEFER);
+  if (result == NavigationThrottle::PROCEED)
+    ReadyToCommitNavigation(render_frame_host, response_headers);
+
+  RunCompleteCallback(result);
+}
+
 void NavigationHandleImpl::ReadyToCommitNavigation(
     RenderFrameHostImpl* render_frame_host,
     scoped_refptr<net::HttpResponseHeaders> response_headers) {
@@ -317,6 +341,7 @@ NavigationHandleImpl::CheckWillStartRequest() {
       case NavigationThrottle::PROCEED:
         continue;
 
+      case NavigationThrottle::BLOCK:
       case NavigationThrottle::CANCEL:
       case NavigationThrottle::CANCEL_AND_IGNORE:
         state_ = CANCELING;
@@ -348,6 +373,7 @@ NavigationHandleImpl::CheckWillRedirectRequest() {
       case NavigationThrottle::PROCEED:
         continue;
 
+      case NavigationThrottle::BLOCK:
       case NavigationThrottle::CANCEL:
       case NavigationThrottle::CANCEL_AND_IGNORE:
         state_ = CANCELING;
@@ -367,6 +393,32 @@ NavigationHandleImpl::CheckWillRedirectRequest() {
   return NavigationThrottle::PROCEED;
 }
 
+NavigationThrottle::ThrottleCheckResult
+NavigationHandleImpl::CheckWillProcessResponse() {
+  DCHECK(state_ == READY_TO_COMMIT);
+  for (size_t i = next_index_; i < throttles_.size(); ++i) {
+    NavigationThrottle::ThrottleCheckResult result =
+        throttles_[i]->WillProcessResponse();
+    switch (result) {
+      case NavigationThrottle::PROCEED:
+        continue;
+
+      case NavigationThrottle::BLOCK:
+      case NavigationThrottle::CANCEL:
+      case NavigationThrottle::CANCEL_AND_IGNORE:
+        state_ = CANCELING;
+        return result;
+
+      case NavigationThrottle::DEFER:
+      default:
+        NOTREACHED();
+    }
+  }
+  next_index_ = 0;
+  state_ = READY_TO_COMMIT;
+  return NavigationThrottle::PROCEED;
+}
+
 void NavigationHandleImpl::RunCompleteCallback(
     NavigationThrottle::ThrottleCheckResult result) {
   DCHECK(result != NavigationThrottle::DEFER);