Expose additional private modules

Summary: - TextInputState as TextInput.State
- Touchable
- flattenStyle as StyleSheet.flatten
- ReactNativeART as ART

Original discussion in #1821
Closes https://github.com/facebook/react-native/pull/3308

Reviewed By: sebmarkbage

Differential Revision: D2527152

Pulled By: javache

fb-gh-sync-id: 19d4ef9d4c0e6587b9f0793e1ca624aebb034f3b

Libraries/ART/ReactNativeART.js

@@ -566,8 +566,14 @@ function Pattern(url, width, height, left, top) {
   this._brush = [PATTERN, url, +left || 0, +top || 0, +width, +height];
 }
 
-var ReactART = {
+// This doesn't work on iOS and is just a placeholder to get Spectrum running.
+// I will try to eliminate this dependency in Spectrum and remove it from
+// ReactART proper.
+function CSSBackgroundPattern() {
+  return new Color('rgba(0,0,0,0)');
+}
 
+var ReactART = {
   LinearGradient: LinearGradient,
   RadialGradient: RadialGradient,
   Pattern: Pattern,
@@ -578,7 +584,7 @@ var ReactART = {
   ClippingRectangle: ClippingRectangle,
   Shape: Shape,
   Text: Text,
-
+  CSSBackgroundPattern: CSSBackgroundPattern
 };
 
 module.exports = ReactART;