Import new C source of truth css-layout

fbshipit-source-id: e866918d6c62fc1cf3a04c269f782b94db9b875a

tests/CSSLayoutTestUtils/CSSLayoutTestUtils.h

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+/**
+ * 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.
+ */
+
+#ifndef __CSS_LAYOUT_TEST_UTILS_H
+#define __CSS_LAYOUT_TEST_UTILS_H
+
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+
+#ifndef __cplusplus
+#include <stdbool.h>
+#endif
+
+#include <CSSLayout/CSSMacros.h>
+#include <CSSLayout/CSSLayout-internal.h>
+#include <CSSLayout/CSSNodeList.h>
+
+#define SMALL_WIDTH 35
+#define SMALL_HEIGHT 18
+#define BIG_WIDTH 172
+#define BIG_HEIGHT 36
+#define SMALL_TEXT "small"
+#define LONG_TEXT "loooooooooong with space"
+#define MEASURE_WITH_RATIO_2 "measureWithRatio2"
+#define MEASURE_WITH_MATCH_PARENT "measureWithMatchParent"
+
+CSS_EXTERN_C_BEGIN
+
+bool test(CSSNode *style, CSSNode *expected_layout);
+CSSSize measure(void *context, float width, CSSMeasureMode widthMode, float height, CSSMeasureMode heightMode);
+void init_css_node_children(CSSNode *node, int childCount);
+CSSNode *new_test_css_node(void);
+
+CSS_EXTERN_C_END
+
+#endif