Move persistent gesture state to Document, add DocumentUserGestureToken

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 "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));
+  }
+
+  ~DocumentUserGestureToken() final {}
+
+ private:
+  DocumentUserGestureToken(Document* document, Status status)
+      : UserGestureToken(status) {
+    if (document)
+      document->setHasReceivedUserGesture();
+  }
+};
+
+}  // namespace blink
+
+#endif  // DocumentUserGestureToken_h