Don't capture touches

Summary:
RCTRootView supports a property `passThroughTouches` which when set, allows
touches to propagate to sibling views. To allow touches to reach RCTRootView,
we also need to set `pointerEvents` on the RCTViews wrapping the child views.

Reviewed By: javache

Differential Revision: D4385443

fbshipit-source-id: 6291d8614870168f1c4cdf0ef5ff6e42e4a8ef63

Libraries/ReactNative/AppContainer.js

@@ -89,8 +89,9 @@ class AppContainer extends React.Component {
     }
 
     return (
-      <View style={styles.appContainer}>
+      <View style={styles.appContainer} pointerEvents="box-none">
         <View
+          pointerEvents="box-none"
           collapsable={!this.state.inspector}
           key={this.state.mainKey}
           style={styles.appContainer} ref={(ref) => {this._mainRef = ref;}}>