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 16 matching lines @@
 [
     DoNotCheckConstants,
     WillBeGarbageCollected,
 ] interface Internals {
     DOMString address(Node node);
 
     GCObservation observeGC(any observed);
 
     [RaisesException] DOMString elementRenderTreeAsText(Element element);
     boolean isPreloaded(DOMString url);
+    boolean isPreloadedBy(DOMString url, Document document);
     boolean isLoadingFromMemoryCache(DOMString url);
 
     void crash();
 
     void setStyleResolverStatsEnabled(boolean enabled);
     [RaisesException] DOMString styleResolverStatsReport();
     [RaisesException] DOMString styleResolverStatsTotalsReport();
 
     [RaisesException] boolean isSharingStyle(Element element1, Element element2);
 
@@ skipping 230 matching lines @@
     [CallWith=ExecutionContext] Promise createPromise();
     [CallWith=ExecutionContext] Promise createResolvedPromise(any value);
     [CallWith=ExecutionContext] Promise createRejectedPromise(any reason);
     [CallWith=ExecutionContext] Promise addOneToPromise(Promise promise);
 
     void startSpeechInput(Element element);
     void setValueForUser(Element element, DOMString value);
 
     DOMString textSurroundingNode(Node node, long x, long y, unsigned long maxLength);
 };