Always reset touch action at the beginning of a new gesture sequence

content/browser/renderer_host/input/web_touch_event_traits.h

+// Copyright 2014 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 CONTENT_COMMON_INPUT_WEB_TOUCH_EVENT_TRAITS_H_
+#define CONTENT_COMMON_INPUT_WEB_TOUCH_EVENT_TRAITS_H_
+
+#include "base/basictypes.h"
+#include "content/common/input/scoped_web_input_event.h"
+#include "third_party/WebKit/public/web/WebInputEvent.h"
+
+namespace content {
+
+// Utility class for performing operations on and with WebTouchEvents.
+class CONTENT_EXPORT WebTouchEventTraits {
+ public:
+  static bool IsTouchSequenceStart(const blink::WebTouchEvent& event);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_INPUT_WEB_TOUCH_EVENT_TRAITS_H_