Fix warning in InputAccessoryView (facebook#21174)

Summary:
Currently the warning is always triggered, even on iOS. This simply adds a platform check and tweak the message.
Pull Request resolved: facebook#21174

Differential Revision: D9929679

Pulled By: hramos

fbshipit-source-id: 383f4a820cf5bf261dbfdcff3b950f9812a65e00

Libraries/Components/TextInput/InputAccessoryView.js

@@ -11,6 +11,7 @@
 
 const ColorPropType = require('ColorPropType');
 const DeprecatedViewPropTypes = require('DeprecatedViewPropTypes');
+const Platform = require('Platform');
 const React = require('React');
 const StyleSheet = require('StyleSheet');
 
@@ -89,7 +90,9 @@ type Props = {
 
 class InputAccessoryView extends React.Component<Props> {
   render(): React.Node {
-    console.warn('<InputAccessoryView> is not supported on Android yet.');
+    if (Platform.OS !== 'ios') {
+      console.warn('<InputAccessoryView> is only supported on iOS.');
+    }
 
     if (React.Children.count(this.props.children) === 0) {
       return null;