Add WebPointerEvent, WebMouseProperties and WebPointerProperties types.

public/web/WebPointerProperties.h

+// Copyright (c) 2015 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 WebPointerProperties_h
+#define WebPointerProperties_h
+
+namespace blink {
+
+// TODO(e_hakkinen): Replace WebTouchEvent with WebPointerEvent, remove
+//                   WebTouchEvent and WebTouchPoint and merge this into
+//                   WebPointerEvent.
+class WebPointerProperties {
+public:
+    WebPointerProperties()
+        : pointerId(0)
+        , width(0.f)
+        , height(0.f)
+        , pressure(0.f)
+    {
+    }
+
+    // TODO(e_hakkinen): Remove old names once Chromium is updated.
+    union {
+        int pointerId;
+        int id;
+    };
+    union {
+        float width;
+        float radiusX;
+    };
+    union {
+        float height;
+        float radiusY;
+    };
+    union {
+        float pressure;
+        float force;
+    };
+};
+
+} // namespace blink
+
+#endif