Replicate feature policy container policies.

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

Index: third_party/WebKit/Source/core/dom/Document.h
diff --git a/third_party/WebKit/Source/core/dom/Document.h b/third_party/WebKit/Source/core/dom/Document.h
index 5478be0cd969217b3f8a38bb51aec88ca25237df..851a0c1f3de5d23bd0215f49a59a7132eedc92d4 100644
--- a/third_party/WebKit/Source/core/dom/Document.h
+++ b/third_party/WebKit/Source/core/dom/Document.h
@@ -628,6 +628,10 @@ class CORE_EXPORT Document : public ContainerNode,
   // base URL of parent will be returned, passed base URL override otherwise.
   const KURL& BaseURLForOverride(const KURL& base_url_override) const;
 
+  // Determines whether a new document should take on the same origin as that of
+  // the document which created it.
+  static bool ShouldInheritSecurityOriginFromOwner(const KURL&);
+
   String UserAgent() const final;
   void DisableEval(const String& error_message) final;