Move YGStyle to seperate file and add constructors

Summary: Moved YGStyle to separate file and added default constructor to it. This diff also gets rid off of the default values, which were earlier declared in Yoga-interna.h and instead uses default constructor. This diff also addresses https://github.com/facebook/yoga/pull/700

Reviewed By: emilsjolander

Differential Revision: D7016575

fbshipit-source-id: eb28df0ffb4cc813b23edaff80d7d4ebc56ce6af

yoga/YGStyle.h

@@ -0,0 +1,43 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+#pragma once
+#include "Yoga-internal.h"
+#include "Yoga.h"
+
+struct YGStyle {
+  YGDirection direction;
+  YGFlexDirection flexDirection;
+  YGJustify justifyContent;
+  YGAlign alignContent;
+  YGAlign alignItems;
+  YGAlign alignSelf;
+  YGPositionType positionType;
+  YGWrap flexWrap;
+  YGOverflow overflow;
+  YGDisplay display;
+  float flex;
+  float flexGrow;
+  float flexShrink;
+  YGValue flexBasis;
+  std::array<YGValue, YGEdgeCount> margin;
+  std::array<YGValue, YGEdgeCount> position;
+  std::array<YGValue, YGEdgeCount> padding;
+  std::array<YGValue, YGEdgeCount> border;
+  std::array<YGValue, 2> dimensions;
+  std::array<YGValue, 2> minDimensions;
+  std::array<YGValue, 2> maxDimensions;
+  float aspectRatio;
+
+  YGStyle();
+  // Yoga specific properties, not compatible with flexbox specification
+  bool operator==(const YGStyle& style);
+
+  bool operator!=(YGStyle style);
+  ~YGStyle();
+};