[ReactNative] implement accessibilityLiveRegion and accessibilityComponentType

Libraries/Components/View/View.js

@@ -44,6 +44,7 @@ var AccessibilityTraits = [
   'pageTurn',
 ];
 
+
 // <<<<< WARNING >>>>>
 // If adding any properties to View that could change the way layout-only status
 // works on iOS, make sure to update ReactNativeViewAttributes.js and
@@ -105,6 +106,18 @@ var View = React.createClass({
       'button',
     ]),
 
+    /**
+     * Indicates to accessibility services whether the user should be notified
+     * when this view changes. Works for Android API >= 19 only.
+     * See http://developer.android.com/reference/android/view/View.html#attr_android:accessibilityLiveRegion
+     * for references.
+     */
+    accessibilityLiveRegion: PropTypes.oneOf([
+      'none',
+      'polite',
+      'assertive',
+    ]),
+
     /**
      * Provides additional traits to screen reader. By default no traits are
      * provided unless specified otherwise in element

Libraries/ReactNative/ReactNativeViewAttributes.js

@@ -20,6 +20,7 @@ ReactNativeViewAttributes.UIView = {
   accessible: true,
   accessibilityLabel: true,
   accessibilityComponentType: true,
+  accessibilityLiveRegion: true,
   accessibilityTraits: true,
   testID: true,
   onLayout: true,