Added blurOnSubmit support to multine TextInput (aka RCTTextView)

Summary:
public

Setting `blurOnSubmit=true` on a multiline `<TextInput>` now causes it to behave like a single-line input with respect to the return key:

With the default value of `false`, pressing return will enter a newline character into the field. If you set the value to `true`, pressing return will now blur the field and trigger the onSubmitEditing event. The newline character will *not* be added to the text.

(See associated github task for dicussion: https://github.com/facebook/react-native/pull/2149)

Reviewed By: javache

Differential Revision: D2710448

fb-gh-sync-id: c9706ae11f8b399932d3400ceb4c7558e455570d

Libraries/Components/TextInput/TextInput.js

@@ -37,7 +37,7 @@ var onlyMultiline = {
 };
 
 var notMultiline = {
-  onSubmitEditing: true,
+  // nothing yet
 };
 
 if (Platform.OS === 'android') {
@@ -47,10 +47,6 @@ if (Platform.OS === 'android') {
   var RCTTextField = requireNativeComponent('RCTTextField', null);
 }
 
-type DefaultProps = {
-  blurOnSubmit: boolean;
-};
-
 type Event = Object;
 
 /**
@@ -73,17 +69,6 @@ type Event = Object;
  * ```
  *
  * Note that some props are only available with `multiline={true/false}`:
- * ```
- *   var onlyMultiline = {
- *     onSelectionChange: true, // not supported in Open Source yet
- *     onTextInput: true, // not supported in Open Source yet
- *     children: true,
- *   };
- *
- *   var notMultiline = {
- *     onSubmitEditing: true,
- *   };
- * ```
  */
 var TextInput = React.createClass({
   statics: {
@@ -304,7 +289,10 @@ var TextInput = React.createClass({
     selectTextOnFocus: PropTypes.bool,
     /**
      * If true, the text field will blur when submitted.
-     * The default value is true.
+     * The default value is true for single-line fields and false for
+     * multiline fields. Note that for multiline fields, setting blurOnSubmit
+     * to true means that pressing return will blur the field and trigger the
+     * onSubmitEditing event instead of inserting a newline into the field.
      * @platform ios
      */
     blurOnSubmit: PropTypes.bool,
@@ -323,12 +311,6 @@ var TextInput = React.createClass({
     underlineColorAndroid: PropTypes.string,
   },
 
-  getDefaultProps: function(): DefaultProps {
-    return {
-      blurOnSubmit: true,
-    };
-  },
-
   /**
    * `NativeMethodsMixin` will look for this when invoking `setNativeProps`. We
    * make `this` look like an actual native component class.