Reenable framebusting

third_party/WebKit/Source/core/dom/DocumentUserGestureToken.h

 // Copyright 2016 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 DocumentUserGestureToken_h
 #define DocumentUserGestureToken_h
 
 #include "core/dom/Document.h"
 #include "core/frame/LocalFrame.h"
 #include "platform/UserGestureIndicator.h"
@@ skipping 18 matching lines @@
     if (!token || !token->hasGestures())
       return nullptr;
     setHasReceivedUserGesture(document);
     return token;
   }
 
  private:
   DocumentUserGestureToken(Status status) : UserGestureToken(status) {}
 
   static void setHasReceivedUserGesture(Document* document) {
-    if (!document || document->hasReceivedUserGesture())
+    if (!document || !document->frame() ||
+        document->frame()->hasReceivedUserGesture()) {
       return;
-    document->setHasReceivedUserGesture();
+    }
+
+    document->frame()->setDocumentHasReceivedUserGesture();

[dcheng, 2017/01/12 10:41:00]

Nit: perhaps remove 'document' from the name, since it's stick to frame now.

     for (Frame* frame = document->frame()->tree().parent(); frame;
          frame = frame->tree().parent()) {
       frame->setDocumentHasReceivedUserGesture();
     }
   }
 };
 
 }  // namespace blink
 
 #endif  // DocumentUserGestureToken_h