Sky: Add a Point class.

sky/engine/core/painting/Point.h

+// Copyright 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 SKY_ENGINE_CORE_PAINTING_POINT_H_
+#define SKY_ENGINE_CORE_PAINTING_POINT_H_
+
+#include "dart/runtime/include/dart_api.h"
+#include "sky/engine/tonic/dart_converter.h"
+#include "third_party/skia/include/core/SkPoint.h"
+
+namespace blink {
+// Very simple wrapper for SkPoint to add a null state.
+class Point {
+ public:
+  SkPoint sk_point;
+  bool is_null;
+};
+
+template<>
+struct DartConverter<Point, void> {
+  static Point FromArgumentsWithNullCheck(Dart_NativeArguments args,
+                                          int index,
+                                          Dart_Handle& exception);
+};
+
+} // namespace blink
+
+#endif  // SKY_ENGINE_CORE_PAINTING_POINT_H_