Navigation transitions (web to native app): Hide/Show transition elements (Blink side)

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.
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     [RaisesException] void setNetworkConnectionInfo(DOMString type);
 
     // This function is for testing HitRegions on Canvas2D.
     unsigned long countHitRegions(CanvasRenderingContext2D context);
 
     [TypeChecking=Interface] ClientRect boundsInRootViewSpace(Element element);
     DOMString serializeNavigationMarkup();
     DOMString[] getTransitionElementIds();
     ClientRectList getTransitionElementRects();
     void hideAllTransitionElements();
+    void showAllTransitionElements();
 
     [RaisesException, TypeChecking=Interface] void forcePluginPlaceholder(HTMLElement plugin, DocumentFragment fragment);
     [RaisesException, TypeChecking=Interface] void forcePluginPlaceholder(HTMLElement plugin, Dictionary options);
 
     DictionaryTest dictionaryTest();
     UnionTypesTest unionTypesTest();
 };