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

Source/web/WebDocument.cpp

Index: Source/web/WebDocument.cpp
diff --git a/Source/web/WebDocument.cpp b/Source/web/WebDocument.cpp
index 18dd122bcdeff8210033b185e1676f6a7bf31327..9c1728756a877ad418293ff862911261303d9676 100644
--- a/Source/web/WebDocument.cpp
+++ b/Source/web/WebDocument.cpp
@@ -290,6 +290,12 @@ void WebDocument::setIsTransitionDocument()
     unwrap<Document>()->setIsTransitionDocument();
 }
 
+void WebDocument::resetIsTransitionDocument()
+{
+    // This ensures the transition UA stylesheet is not applied when reverting the transition.
+    unwrap<Document>()->resetIsTransitionDocument();
+}
+
 // FIXME: This will be removed once the Chrome side implementation is done
 void WebDocument::beginExitTransition(const WebString& cssSelector)
 {
@@ -304,6 +310,12 @@ void WebDocument::beginExitTransition(const WebString& cssSelector, bool exitToN
     document->styleEngine()->enableExitTransitionStylesheets();
 }
 
+void WebDocument::revertExitTransition()
+{
+    RefPtrWillBeRawPtr<Document> document = unwrap<Document>();
+    document->styleEngine()->disableExitTransitionStylesheets();
+}
+
 void WebDocument::hideTransitionElements(const WebString& cssSelector)
 {
     RefPtrWillBeRawPtr<Document> document = unwrap<Document>();