Implement NavigationThrottle::BLOCK_REQUEST_AND_COLLAPSE.

third_party/WebKit/Source/core/html/HTMLFrameOwnerElement.h

 /*
  * Copyright (C) 2006, 2007, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 39 matching lines @@
   DOMWindow* contentWindow() const;
   Document* contentDocument() const;
 
   virtual void DisconnectContentFrame();
 
   // Most subclasses use LayoutPart (either LayoutEmbeddedObject or
   // LayoutIFrame) except for HTMLObjectElement and HTMLEmbedElement which may
   // return any LayoutObject when using fallback content.
   LayoutPart* GetLayoutPart() const;
 
+  // Whether to collapse the frame owner element in the embedder document. That
+  // is, to remove it from the layout as if it did not exist.
+  virtual void SetCollapsedByClient(bool) {}

[dcheng, 2017/05/10 06:59:46]

"client" is pretty vague. Maybe just remove "ByClient", as it's not really clear
what client this refers to.

[engedy, 2017/05/15 13:35:51]

Done.

+
   Document* getSVGDocument(ExceptionState&) const;
 
   virtual bool LoadedNonEmptyDocument() const { return false; }
   virtual void DidLoadNonEmptyDocument() {}
 
   void SetWidget(FrameViewBase*);
   FrameViewBase* ReleaseWidget();
   FrameViewBase* OwnedWidget() const;
 
   class UpdateSuspendScope {
@@ skipping 119 matching lines @@
 
 DEFINE_TYPE_CASTS(HTMLFrameOwnerElement,
                   FrameOwner,
                   owner,
                   owner->IsLocal(),
                   owner.IsLocal());
 
 }  // namespace blink
 
 #endif  // HTMLFrameOwnerElement_h