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

Source/web/WebDocument.cpp

 /*
  * Copyright (C) 2009 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 266 matching lines @@
     return WebSize();
 }
 
 WebSize WebDocument::maximumScrollOffset() const
 {
     if (FrameView* view = constUnwrap<Document>()->view())
         return toIntSize(view->maximumScrollPosition());
     return WebSize();
 }
 
+// FIXME: This will be removed once Chrome side implementation is done.
 void WebDocument::setIsTransitionDocument()
 {
     // This ensures the transition UA stylesheet gets applied.
-    unwrap<Document>()->setIsTransitionDocument();
+    unwrap<Document>()->setIsTransitionDocument(true);
+}
+
+void WebDocument::setIsTransitionDocument(bool isTransitionDocument)
+{
+    // When isTransitionDocument is true, it ensures the transition UA
+    // stylesheet gets applied. When isTransitionDocument is false, it ensures
+    // the transition UA stylesheet is not applied when reverting the transition.
+    unwrap<Document>()->setIsTransitionDocument(isTransitionDocument);
 }
 
 void WebDocument::beginExitTransition(const WebString& cssSelector, bool exitToNativeApp)
 {
     RefPtrWillBeRawPtr<Document> document = unwrap<Document>();
     if (!exitToNativeApp)
         document->hideTransitionElements(cssSelector);
-    document->styleEngine()->enableExitTransitionStylesheets();
+    document->styleEngine()->setExitTransitionStylesheetsEnabled(true);
+}
+
+void WebDocument::revertExitTransition()
+{
+    RefPtrWillBeRawPtr<Document> document = unwrap<Document>();
+    document->styleEngine()->setExitTransitionStylesheetsEnabled(false);
 }
 
 void WebDocument::hideTransitionElements(const WebString& cssSelector)
 {
     RefPtrWillBeRawPtr<Document> document = unwrap<Document>();
     document->hideTransitionElements(cssSelector);
 }
 
 void WebDocument::showTransitionElements(const WebString& cssSelector)
 {
@@ skipping 66 matching lines @@
     m_private = elem;
     return *this;
 }
 
 WebDocument::operator PassRefPtrWillBeRawPtr<Document>() const
 {
     return toDocument(m_private.get());
 }
 
 } // namespace blink