Merge pull request facebook#73 from gunnigylfa/add-pixel-ratio-api

Add PixelRatio bindings

Author: wokalski

src/pixelRatioRe.re

@@ -0,0 +1,7 @@
+external get : unit => float = "get" [@@bs.scope "PixelRatio"] [@@bs.module "react-native"];
+
+external getFontScale : unit => float = "getFontScale" [@@bs.scope "PixelRatio"] [@@bs.module "react-native"];
+
+external getPixelSizeForLayoutSize : int => int = "getPixelSizeForLayoutSize" [@@bs.scope "PixelRatio"] [@@bs.module "react-native"];
+
+external roundToNearestPixel : float => float = "roundToNearestPixel" [@@bs.scope "PixelRatio"] [@@bs.module "react-native"];

src/pixelRatioRe.rei

@@ -0,0 +1,7 @@
+let get: unit => float;
+
+let getFontScale: unit => float;
+
+let getPixelSizeForLayoutSize: int => int;
+
+let roundToNearestPixel: float => float;

src/reactNative.re

@@ -84,6 +84,8 @@ module NativeEventEmitter = NativeEventEmitterRe;
 
 module Platform = PlatformRe;
 
+module PixelRatio = PixelRatioRe;
+
 module StyleSheet = StyleSheetRe;
 
 module PanResponder = {