HTML Imports: Teach preloader about HTML Imports.

Source/core/testing/Internals.idl

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple 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.
@@ skipping 17 matching lines @@
     DoNotCheckConstants,
     GarbageCollected,
     TypeChecking=Interface,
 ] interface Internals {
     DOMString address(Node node);
 
     GCObservation observeGC(any observed);
 
     [RaisesException, TypeChecking=Interface] DOMString elementLayoutTreeAsText(Element element);
     boolean isPreloaded(DOMString url);
+    boolean isPreloadedBy(DOMString url, Document document);
     boolean isLoadingFromMemoryCache(DOMString url);
 
     [TypeChecking=Interface] boolean isSharingStyle(Element element1, Element element2);
 
     [TypeChecking=Interface] CSSStyleDeclaration computedStyleIncludingVisitedInfo(Node node);
 
     [TypeChecking=Interface] ShadowRoot createUserAgentShadowRoot(Element host);
 
     [TypeChecking=Interface] ShadowRoot shadowRoot(Element host);
     [TypeChecking=Interface] ShadowRoot youngestShadowRoot(Element host);
@@ skipping 264 matching lines @@
 
     boolean isUseCounted(Document document, long useCounterId);
 
     iterable<long>;
 
     [Unscopeable] readonly attribute DOMString unscopeableAttribute;
     [Unscopeable] DOMString unscopeableMethod();
 
     ClientRectList focusRingRects(Element element);
 };