Unify TouchAction classes

third_party/WebKit/public/platform/WebTouchAction.h

Index: third_party/WebKit/public/platform/WebTouchAction.h
diff --git a/third_party/WebKit/public/platform/WebTouchAction.h b/third_party/WebKit/public/platform/WebTouchAction.h
new file mode 100644
index 0000000000000000000000000000000000000000..88bd63c583787943540027873bb1a1e67aa17d96
--- /dev/null
+++ b/third_party/WebKit/public/platform/WebTouchAction.h
@@ -0,0 +1,19 @@
+// 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
+
+#include "cc/input/touch_action.h"
+
+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