Navigation transitions (web to native app): Revert exit transition (Blink side)

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 f7790f496946375f97c08df5fdb073a5ff5ff433..2063e94de1f0ba1536770b5e02a547fe02056a4c 100644
--- a/Source/core/testing/Internals.cpp
+++ b/Source/core/testing/Internals.cpp
@@ -2291,6 +2291,16 @@ void Internals::showAllTransitionElements()
         frame()->document()->showTransitionElements(AtomicString(iter->selector));
 }
 
+void Internals::enableExitTransitionStylesheets()
+{
+    frame()->document()->styleEngine()->enableExitTransitionStylesheets();
+}
+
+void Internals::disableExitTransitionStylesheets()
+{
+    frame()->document()->styleEngine()->disableExitTransitionStylesheets();
+}
+
 void Internals::forcePluginPlaceholder(HTMLElement* element, PassRefPtrWillBeRawPtr<DocumentFragment> fragment, ExceptionState& exceptionState)
 {
     if (!element->isPluginElement()) {