Move container policy logic to frame owner classes.

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 108 matching lines @@
   void FrameOwnerPropertiesChanged();
 
   // Return the origin which is to be used for feature policy container
   // policies, as "the origin of the URL in the frame's src attribute" (see
   // https://wicg.github.io/feature-policy/#iframe-allow-attribute).
   // This method is intended to be overridden by specific frame classes.
   virtual RefPtr<SecurityOrigin> GetOriginForFeaturePolicy() const {
     return SecurityOrigin::CreateUnique();
   }
 
-  // Construct a new feature policy container policy for this frame, based on
-  // the frame attributes and the effective origin specified in the frame
-  // attributes.
+  // Return a feature policy container policy for this frame, based on the
+  // frame attributes and the effective origin specified in the frame
+  // attributes. The base implementation here uses the "allow" attribute, but
+  // additional attributes and or restrictions may be introduced by specific
+  // frame classses.
+  virtual Vector<WebParsedFeaturePolicyDeclaration> ConstructContainerPolicy()
+      const;
+
+  // Update the container policy and notify the frame loader client of any
+  // changes.
   void UpdateContainerPolicy();
 
  private:
   // Intentionally private to prevent redundant checks when the type is
   // already HTMLFrameOwnerElement.
   bool IsLocal() const final { return true; }
   bool IsRemote() const final { return false; }
 
   bool IsFrameOwnerElement() const final { return true; }
 
@@ skipping 50 matching lines @@
 
 DEFINE_TYPE_CASTS(HTMLFrameOwnerElement,
                   FrameOwner,
                   owner,
                   owner->IsLocal(),
                   owner.IsLocal());
 
 }  // namespace blink
 
 #endif  // HTMLFrameOwnerElement_h