[Extensions] Make port creation synchronous in unload handlers

third_party/WebKit/public/web/WebDocument.h

 /*
  * 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 118 matching lines @@
   BLINK_EXPORT WebAXObject focusedAccessibilityObject() const;
 
   // Inserts the given CSS source code as a stylesheet in the document.
   BLINK_EXPORT void insertStyleSheet(const WebString& sourceCode);
 
   // Arranges to call WebFrameClient::didMatchCSS(frame(), ...) when one of
   // the selectors matches or stops matching an element in this document.
   // Each call to this method overrides any previous calls.
   BLINK_EXPORT void watchCSSSelectors(const WebVector<WebString>& selectors);
 
+  BLINK_EXPORT bool unloadStarted() const;
+  BLINK_EXPORT bool processingBeforeUnload() const;
+
   BLINK_EXPORT WebVector<WebDraggableRegion> draggableRegions() const;
 
   BLINK_EXPORT v8::Local<v8::Value> registerEmbedderCustomElement(
       const WebString& name,
       v8::Local<v8::Value> options,
       WebExceptionCode&);
 
   BLINK_EXPORT WebURL manifestURL() const;
   BLINK_EXPORT bool manifestUseCredentials() const;
   BLINK_EXPORT WebDistillabilityFeatures distillabilityFeatures();
 
 #if BLINK_IMPLEMENTATION
   BLINK_EXPORT WebDocument(Document*);
   BLINK_EXPORT WebDocument& operator=(Document*);
   BLINK_EXPORT operator Document*() const;
 #endif
 };
 
 DECLARE_WEB_NODE_TYPE_CASTS(WebDocument);
 
 }  // namespace blink
 
 #endif