Sky: Add a Point class.

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