Create NavigationHandles for interstitials if needed

content/browser/frame_host/navigator.h

Index: content/browser/frame_host/navigator.h
diff --git a/content/browser/frame_host/navigator.h b/content/browser/frame_host/navigator.h
index 05caf6abbd14b30c27ba13b4e8e0249b4ca0ab43..352e1945b7e3c34b9bef6c6be248a9e3bd0f3f27 100644
--- a/content/browser/frame_host/navigator.h
+++ b/content/browser/frame_host/navigator.h
@@ -27,6 +27,7 @@ class FrameNavigationEntry;
 class FrameTreeNode;
 class NavigationControllerImpl;
 class NavigationEntryImpl;
+class NavigationHandleImpl;
 class NavigationRequest;
 class RenderFrameHostImpl;
 class ResourceRequestBodyImpl;
@@ -179,6 +180,9 @@ class CONTENT_EXPORT Navigator : public base::RefCounted<Navigator> {
       const base::TimeTicks& renderer_before_unload_start_time,
       const base::TimeTicks& renderer_before_unload_end_time) {}
 
+  virtual NavigationHandleImpl* GetNavigationHandleForFrameHost(

[Charlie Reis, 2016/09/23 18:51:11]

Please add a comment about why this takes in a RFH (i.e., each frame can have
its own NavHandle).

[clamy, 2016/09/26 11:37:27]

Done.

+      RenderFrameHostImpl* render_frame_host);
+
  protected:
   friend class base::RefCounted<Navigator>;
   virtual ~Navigator() {}