Expose Document::isPrivilegedContext from WebDocument

Source/web/WebDocument.cpp

 /*
  * Copyright (C) 2009 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 64 matching lines @@
     return constUnwrap<Document>()->url();
 }
 
 WebSecurityOrigin WebDocument::securityOrigin() const
 {
     if (!constUnwrap<Document>())
         return WebSecurityOrigin();
     return WebSecurityOrigin(constUnwrap<Document>()->securityOrigin());
 }
 
+bool WebDocument::isPrivilegedContext(WebString& errorMessage)
+{
+    Document* document = unwrap<Document>();

[jww, 2015/05/12 02:35:20]

I *think* isPrivilegedContext() actually could be made const, and then the
unwrap could be made a constUnwrap(). If you're feeling generous, you might
consider making that change, but it's also not necessary.

+    if (!document)
+        return false;
+    String message;
+    bool result = document->isPrivilegedContext(message);
+    errorMessage = message;
+    return result;
+}
+
 WebString WebDocument::encoding() const
 {
     return constUnwrap<Document>()->encodingName();
 }
 
 WebString WebDocument::contentLanguage() const
 {
     return constUnwrap<Document>()->contentLanguage();
 }
 
@@ skipping 298 matching lines @@
     m_private = elem;
     return *this;
 }
 
 WebDocument::operator PassRefPtrWillBeRawPtr<Document>() const
 {
     return toDocument(m_private.get());
 }
 
 } // namespace blink