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

Source/core/testing/Internals.cpp

Index: Source/core/testing/Internals.cpp
diff --git a/Source/core/testing/Internals.cpp b/Source/core/testing/Internals.cpp
index 10b9f59653280f99c142f7e9730b84d68a76d807..702e7a0b72b78dc9fce1feda1d6f33851622cdff 100644
--- a/Source/core/testing/Internals.cpp
+++ b/Source/core/testing/Internals.cpp
@@ -2263,7 +2263,7 @@ unsigned Internals::countHitRegions(CanvasRenderingContext2D* context)
     return context->hitRegionsCount();
 }
 
-String Internals::serializeNavigationMarkup(Document* document)
+String Internals::serializeNavigationMarkup()
 {
     Vector<Document::TransitionElementData> elementData;
     frame()->document()->getTransitionElementData(elementData);
@@ -2276,4 +2276,14 @@ String Internals::serializeNavigationMarkup(Document* document)
     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