Navigation transitions: Hide transition elements by setting CSS opacity rather than display.

Source/core/testing/Internals.cpp

 /*
  * 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 2245 matching lines @@
         return;
     }
     networkStateNotifier().setWebConnectionTypeForTest(webtype);
 }
 
 unsigned Internals::countHitRegions(CanvasRenderingContext2D* context)
 {
     return context->hitRegionsCount();
 }
 
-String Internals::serializeNavigationMarkup(Document* document)
+String Internals::serializeNavigationMarkup()
 {
     Vector<Document::TransitionElementData> elementData;
     frame()->document()->getTransitionElementData(elementData);
 
     StringBuilder markup;
     Vector<Document::TransitionElementData>::iterator iter = elementData.begin();
     for (; iter != elementData.end(); ++iter)
         markup.append(iter->markup);
 
     return markup.toString();
 }
 
+void Internals::hideAllTransitionElements()
+{
+    Vector<Document::TransitionElementData> elementData;
+    frame()->document()->getTransitionElementData(elementData);
+
+    Vector<Document::TransitionElementData>::iterator iter = elementData.begin();
+    for (; iter != elementData.end(); ++iter)
+        frame()->document()->hideTransitionElements(AtomicString(iter->selector));
+}
+
 } // namespace blink