Ported TabBarIOS to OSS and unified implementation

Libraries/Components/TabBarIOS/TabBarItemIOS.android.js

@@ -0,0 +1,38 @@
+/**
+ * Copyright 2004-present Facebook. All Rights Reserved.
+ *
+ * @providesModule TabBarItemIOS
+ */
+
+'use strict';
+
+var Dimensions = require('Dimensions');
+var React = require('React');
+var View = require('View');
+var StyleSheet = require('StyleSheet');
+
+var DummyTab = React.createClass({
+  render: function() {
+    if (!this.props.selected) {
+      return <View />;
+    }
+    return (
+      <View style={[this.props.style, styles.tab]}>
+        {this.props.children}
+      </View>
+    );
+  }
+});
+
+var styles = StyleSheet.create({
+  tab: {
+    // TODO(5405356): Implement overflow: visible so position: absolute isn't useless
+    // position: 'absolute',
+    width: Dimensions.get('window').width,
+    height: Dimensions.get('window').height,
+    borderColor: 'red',
+    borderWidth: 1,
+  }
+});
+
+module.exports = DummyTab;