Unify TouchAction classes

third_party/WebKit/public/platform/WebTouchAction.h

+// Copyright 2017 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 WebTouchAction_h
+#define WebTouchAction_h
+
+#if BLINK_IMPLEMENTATION
+#include "platform/graphics/TouchAction.h"
+#else
+#include "cc/input/touch_action.h"
+#endif
+
+namespace blink {
+
+// The only reason of creating a WebTouchAction is that there is a virtual
+// function under WebWidgetClient that is overridden by classes under content/
+// and WebKit/.
+using WebTouchAction = cc::TouchAction;
+
+}  // namespace blink
+
+#endif  // WebTouchAction_h