TEST ONLY: Duplicate FP rather than modifying in place

third_party/WebKit/public/platform/Platform.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 667 matching lines @@
   virtual WebTrialTokenValidator* trialTokenValidator() { return nullptr; }
 
   // Memory ------------------------------------------------------------
 
   // Requests purging memory. The platform may or may not purge memory,
   // depending on memory pressure.
   virtual void requestPurgeMemory() {}
 
   // Feature Policy -----------------------------------------------------
 
+  // Create a new feature policy object for a document, given its parent
+  // document's policy (may be nullptr), its container policy (may be empty),
+  // the header policy with which it was delivered (may be empty), and the
+  // document's origin.
   virtual WebFeaturePolicy* createFeaturePolicy(
       const WebFeaturePolicy* parentPolicy,
       const WebParsedFeaturePolicyHeader& containerPolicy,
       const WebParsedFeaturePolicyHeader& policyHeader,
       const WebSecurityOrigin&) {
     return nullptr;
   }
-  virtual void resetFeaturePolicyOrigin(WebFeaturePolicy* parentPolicy,
-                                        const WebSecurityOrigin&) {}
+
+  // Create a new feature policy for a document whose origin has changed, given
+  // the previous policy object and the new origin.
+  virtual WebFeaturePolicy* duplicateFeaturePolicyWithOrigin(
+      const WebFeaturePolicy&,
+      const WebSecurityOrigin&) {
+    return nullptr;
+  }
 
  protected:
   Platform();
   virtual ~Platform() {}
 
   WebThread* m_mainThread;
 };
 
 }  // namespace blink
 
 #endif