Implement the 'noopener' window feature.

third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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 1478 matching lines @@
         if (targetFrame->domWindow()->isInsecureScriptAccess(*callingWindow, completedURL))
             return targetFrame->domWindow();
 
         if (urlString.isEmpty())
             return targetFrame->domWindow();
 
         targetFrame->navigate(*activeDocument, completedURL, false, UserGestureStatus::None);
         return targetFrame->domWindow();
     }
 
-    return createWindow(urlString, frameName, WindowFeatures(windowFeaturesString), *callingWindow, *firstFrame, *frame());
+    WindowFeatures features(windowFeaturesString);
+    RefPtrWillBeRawPtr<DOMWindow> newWindow = createWindow(urlString, frameName, features, *callingWindow, *firstFrame, *frame());
+    return features.noopener ? nullptr : newWindow;
 }
 
 DEFINE_TRACE(LocalDOMWindow)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_frameObserver);
     visitor->trace(m_document);
     visitor->trace(m_properties);
     visitor->trace(m_screen);
     visitor->trace(m_history);
@@ skipping 19 matching lines @@
 {
     // If the LocalDOMWindow still has a frame reference, that frame must point
     // back to this LocalDOMWindow: otherwise, it's easy to get into a situation
     // where script execution leaks between different LocalDOMWindows.
     if (m_frameObserver->frame())
         ASSERT_WITH_SECURITY_IMPLICATION(m_frameObserver->frame()->domWindow() == this);
     return m_frameObserver->frame();
 }
 
 } // namespace blink