Fixing edge case issue in Yoga where text node was unnecessary rounded down

Summary: There was an uncovered edge case where number close to the whole was forced to round down because it was considered non-whole and had forced flooring. This diff covers that + adds a bunch of test cases to cover rounding function

Reviewed By: emilsjolander

Differential Revision: D5465632

fbshipit-source-id: 57e11092a97eba5dd76daad15fa8619535ff9c1b

yoga/Yoga-internal.h

@@ -0,0 +1,19 @@
+/**
+ * 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
+
+YG_EXTERN_C_BEGIN
+
+WIN_EXPORT float YGRoundValueToPixelGrid(const float value,
+                                         const float pointScaleFactor,
+                                         const bool forceCeil,
+                                         const bool forceFloor);
+
+YG_EXTERN_C_END