Implement textTransform prop

Summary:
Added to C++ props, but realized this is already implemented using C++ state in Android, so added to C++ state to keep this diff simpler. Keeping the C++ props change for future use.

Changelog: [Internal]

Reviewed By: JoshuaGross

Differential Revision: D29805267

fbshipit-source-id: c1fe2dc34af8bc69352ee48a5d60ba998194e3f7

ReactCommon/react/renderer/attributedstring/TextAttributes.cpp

@@ -50,6 +50,9 @@ void TextAttributes::apply(TextAttributes textAttributes) {
   letterSpacing = !std::isnan(textAttributes.letterSpacing)
       ? textAttributes.letterSpacing
       : letterSpacing;
+  textTransform = textAttributes.textTransform.hasValue()
+      ? textAttributes.textTransform
+      : textTransform;
 
   // Paragraph Styles
   lineHeight = !std::isnan(textAttributes.lineHeight)
@@ -120,7 +123,8 @@ bool TextAttributes::operator==(const TextAttributes &rhs) const {
              textShadowColor,
              isHighlighted,
              layoutDirection,
-             accessibilityRole) ==
+             accessibilityRole,
+             textTransform) ==
       std::tie(
              rhs.foregroundColor,
              rhs.backgroundColor,
@@ -139,7 +143,8 @@ bool TextAttributes::operator==(const TextAttributes &rhs) const {
              rhs.textShadowColor,
              rhs.isHighlighted,
              rhs.layoutDirection,
-             rhs.accessibilityRole) &&
+             rhs.accessibilityRole,
+             rhs.textTransform) &&
       floatEquality(opacity, rhs.opacity) &&
       floatEquality(fontSize, rhs.fontSize) &&
       floatEquality(fontSizeMultiplier, rhs.fontSizeMultiplier) &&