[ReactNative] expose importantForAccessibility to JS

Libraries/Components/View/View.js

@@ -100,6 +100,7 @@ var View = React.createClass({
     /**
      * Indicates to accessibility services to treat UI component like a
      * native one. Works for Android only.
+     * @platform android
      */
     accessibilityComponentType: PropTypes.oneOf([
       'none',
@@ -111,6 +112,7 @@ var View = React.createClass({
      * 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.
+     * @platform android
      */
     accessibilityLiveRegion: PropTypes.oneOf([
       'none',
@@ -118,9 +120,33 @@ var View = React.createClass({
       'assertive',
     ]),
 
+    /**
+     * Controls how view is important for accessibility which is if it
+     * fires accessibility events and if it is reported to accessibility services
+     * that query the screen. Works for Android only.
+     * See http://developer.android.com/reference/android/R.attr.html#importantForAccessibility
+     * for references.
+     * Possible values:
+     * 'auto' - The system determines whether the view is important for accessibility -
+     *    default (recommended).
+     * 'yes' - The view is important for accessibility.
+     * 'no' - The view is not important for accessibility.
+     * 'no-hide-descendants' - The view is not important for accessibility,
+     *    nor are any of its descendant views.
+     *
+     * @platform android
+     */
+    importantForAccessibility: PropTypes.oneOf([
+      'auto',
+      'yes',
+      'no',
+      'no-hide-descendants',
+    ]),
+
     /**
      * Provides additional traits to screen reader. By default no traits are
      * provided unless specified otherwise in element
+     * @platform ios
      */
     accessibilityTraits: PropTypes.oneOfType([
       PropTypes.oneOf(AccessibilityTraits),