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Summary: The reason for this change is to implement `allowFontScaling` on the Android's React Native Text component. Prior to this PR `allowFontScaling` only works for iOS. The following link contains images of `allowFontScaling` working in Android on small, normal, large, and huge system fonts (from native Android display settings) http://imgur.com/a/94bF1 The following link is a video of the same thing working on an Android emulator https://youtu.be/1jTlZhPdj9Y Here is the sample code snippet driving the video/images ``` render() { const size = [12, 14, 16, 18]; return ( <View style={{backgroundColor: 'white', flex: 1}}> <Text> Default size no allowFontScaling prop (default true) </Text> <Text allowFontScaling={true}> Default size allowFontScaling: true </Text> <Text style={{ marginBottom: 10, }} allowFontScaling={false}> Default size allowFontScaling: false </Text> { size.map( Closes https://github.com/facebook/react-native/pull/10898 Differential Revision: D4335190 Pulled By: lacker fbshipit-source-id: 0480809c44983644ff2abfcaf4887569b2bfede5