Add basic Referrer-Policy support for Documents

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

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 131 matching lines @@
     void allowWindowInteraction();
     void consumeWindowInteraction();
     bool isWindowInteractionAllowed() const;
 
     // Decides whether this context is privileged, as described in
     // https://w3c.github.io/webappsec/specs/powerfulfeatures/#settings-privileged.
     virtual bool isSecureContext(String& errorMessage, const SecureContextCheck = StandardSecureContextCheck) const = 0;
     virtual bool isSecureContext(const SecureContextCheck = StandardSecureContextCheck) const;
 
     virtual String outgoingReferrer() const;
+    // Parses a comma-separated list of referrer policy tokens, and sets
+    // the context's referrer policy to the last one that is a valid
+    // policy. Logs a message to the console if none of the policy
+    // tokens are valid policies.
+    void parseAndSetReferrerPolicy(const String& policies);
     void setReferrerPolicy(ReferrerPolicy);
     ReferrerPolicy getReferrerPolicy() const { return m_referrerPolicy; }
 
 protected:
     ExecutionContext();
     virtual ~ExecutionContext();
 
     virtual const KURL& virtualURL() const = 0;
     virtual KURL virtualCompleteURL(const String&) const = 0;
 
@@ skipping 20 matching lines @@
 
     Deque<std::unique_ptr<SuspendableTask>> m_suspendedTasks;
     bool m_isRunSuspendableTasksScheduled;
 
     ReferrerPolicy m_referrerPolicy;
 };
 
 } // namespace blink
 
 #endif // ExecutionContext_h