Create NavigationHandles for interstitials if needed

content/browser/frame_host/navigator_delegate.h

 // Copyright 2013 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_NAVIGATOR_DELEGATE_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_DELEGATE_H_
 
+#include "base/memory/scoped_vector.h"
 #include "base/strings/string16.h"
 #include "content/public/browser/invalidate_type.h"
 #include "content/public/browser/navigation_controller.h"
+#include "content/public/browser/navigation_throttle.h"
 #include "content/public/browser/reload_type.h"
 #include "ui/base/page_transition_types.h"
 #include "ui/base/window_open_disposition.h"
 
 class GURL;
 struct FrameHostMsg_DidCommitProvisionalLoad_Params;
 struct FrameHostMsg_DidFailProvisionalLoadWithError_Params;
 
 namespace content {
 
@@ skipping 104 matching lines @@
   // navigation, or triggered by history.pushState/replaceState.
   virtual void DidStartLoading(FrameTreeNode* frame_tree_node,
                                bool to_different_document) {}
 
   // A document stopped loading. This corresponds to Blink's notion of the
   // throbber stopping.
   virtual void DidStopLoading() {}
 
   // The load progress was changed.
   virtual void DidChangeLoadProgress() {}
+
+  // Returns the NavigationThrottles to add to this navigation. Normally these
+  // are defined by the content/ embedder, except in the case of interstitials
+  // where no NavigationThrottles are added to the navigation.
+  virtual ScopedVector<NavigationThrottle> CreateThrottlesForNavigation(
+      NavigationHandle* navigation_handle);
 };
 
 }  // namspace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_DELEGATE_H_