Replicate feature policy container policies.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Simon Hausmann <hausmann@kde.org>
  * Copyright (C) 2004, 2006, 2008, 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.
@@ skipping 24 matching lines @@
 
   // FrameOwner overrides:
   ScrollbarMode ScrollingMode() const final { return scrolling_mode_; }
   int MarginWidth() const final { return margin_width_; }
   int MarginHeight() const final { return margin_height_; }
 
  protected:
   HTMLFrameElementBase(const QualifiedName&, Document&);
 
   void ParseAttribute(const AttributeModificationParams&) override;
+
+  // Return the origin which is to be used for feature policy container
+  // policies, when a specific origin is needed. This supports the "allow"
+  // attribute, which uses the "src" attribute to determine the origin when the
+  // frame is constructed. It also takes into account the frame's sandbox
+  // status, and whether the frame should inherit its parent's origin.
+  const RefPtr<SecurityOrigin> GetOriginForFeaturePolicy() const override;
+
   InsertionNotificationRequest InsertedInto(ContainerNode*) override;
   void DidNotifySubtreeInsertionsToDocument() final;
   void AttachLayoutTree(const AttachContext& = AttachContext()) override;
 
   void SetScrollingMode(ScrollbarMode);
   void SetMarginWidth(int);
   void SetMarginHeight(int);
 
  private:
   bool SupportsFocus() const final;
@@ skipping 20 matching lines @@
 
 inline bool IsHTMLFrameElementBase(const HTMLElement& element) {
   return isHTMLFrameElement(element) || isHTMLIFrameElement(element);
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLFrameElementBase);
 
 }  // namespace blink
 
 #endif  // HTMLFrameElementBase_h