Document user gesture state should be able to propagate over postMessage

third_party/WebKit/Source/core/dom/DocumentUserGestureToken.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DocumentUserGestureToken_h
 #define DocumentUserGestureToken_h
 
 #include "core/dom/Document.h"
 #include "core/frame/LocalFrame.h"
 #include "platform/UserGestureIndicator.h"
 
 namespace blink {
 
 // Associates a UserGestureToken with a Document, if a non-null Document*
 // is provided in the constructor.
 class DocumentUserGestureToken final : public UserGestureToken {
   WTF_MAKE_NONCOPYABLE(DocumentUserGestureToken);
 
  public:
   static PassRefPtr<UserGestureToken> create(
       Document* document,
       Status status = PossiblyExistingGesture) {
-    return adoptRef(new DocumentUserGestureToken(document, status));
+    setHasReceivedUserGesture(document);
+    return adoptRef(new DocumentUserGestureToken(status));
   }
 
-  ~DocumentUserGestureToken() final {}
+  static PassRefPtr<UserGestureToken> adopt(Document* document,
+                                            UserGestureToken* token) {
+    if (!token || !token->hasGestures())
+      return nullptr;
+    setHasReceivedUserGesture(document);
+    return token;
+  }
 
  private:
-  DocumentUserGestureToken(Document* document, Status status)
-      : UserGestureToken(status) {
+  DocumentUserGestureToken(Status status) : UserGestureToken(status) {}
+
+  static void setHasReceivedUserGesture(Document* document) {
     if (!document || document->hasReceivedUserGesture())
       return;
     document->setHasReceivedUserGesture();
     for (Frame* frame = document->frame()->tree().parent(); frame;
          frame = frame->tree().parent()) {
       frame->setDocumentHasReceivedUserGesture();
     }
   }
 };
 
 }  // namespace blink
 
 #endif  // DocumentUserGestureToken_h