[ReactNative] ScrollView docs

Summary:
In preparation for open sourcing React Native for Android, document which ScrollView props are platform-specific.

Libraries/Components/ScrollView/ScrollView.js

@@ -53,44 +53,54 @@ var INNERVIEW = 'InnerScrollView';
  * Doesn't yet support other contained responders from blocking this scroll
  * view from becoming the responder.
  */
-
 var ScrollView = React.createClass({
   propTypes: {
-    automaticallyAdjustContentInsets: PropTypes.bool, // true
-    contentInset: EdgeInsetsPropType, // zeros
-    contentOffset: PointPropType, // zeros
-    onScroll: PropTypes.func,
-    onScrollAnimationEnd: PropTypes.func,
-    scrollEnabled: PropTypes.bool, // true
-    scrollIndicatorInsets: EdgeInsetsPropType, // zeros
-    showsHorizontalScrollIndicator: PropTypes.bool,
-    showsVerticalScrollIndicator: PropTypes.bool,
-    style: StyleSheetPropType(ViewStylePropTypes),
-    scrollEventThrottle: PropTypes.number, // null
-
+    /**
+     * Controls whether iOS should automatically adjust the content inset
+     * for scroll views that are placed behind a navigation bar or
+     * tab bar/ toolbar. The default value is true.
+     * @platform ios
+     */
+    automaticallyAdjustContentInsets: PropTypes.bool,
+    /**
+     * The amount by which the scroll view content is inset from the edges
+     * of the scroll view. Defaults to `{0, 0, 0, 0}`.
+     * @platform ios
+     */
+    contentInset: EdgeInsetsPropType,
+    /**
+     * Used to manually set the starting scroll offset.
+     * The default value is `{x: 0, y: 0}`.
+     * @platform ios
+     */
+    contentOffset: PointPropType,
     /**
      * When true, the scroll view bounces when it reaches the end of the
      * content if the content is larger then the scroll view along the axis of
      * the scroll direction. When false, it disables all bouncing even if
      * the `alwaysBounce*` props are true. The default value is true.
+     * @platform ios
      */
     bounces: PropTypes.bool,
     /**
      * When true, gestures can drive zoom past min/max and the zoom will animate
      * to the min/max value at gesture end, otherwise the zoom will not exceed
      * the limits.
+     * @platform ios
      */
     bouncesZoom: PropTypes.bool,
     /**
      * When true, the scroll view bounces horizontally when it reaches the end
      * even if the content is smaller than the scroll view itself. The default
      * value is true when `horizontal={true}` and false otherwise.
+     * @platform ios
      */
     alwaysBounceHorizontal: PropTypes.bool,
     /**
      * When true, the scroll view bounces vertically when it reaches the end
      * even if the content is smaller than the scroll view itself. The default
      * value is false when `horizontal={true}` and true otherwise.
+     * @platform ios
      */
     alwaysBounceVertical: PropTypes.bool,
     /**
@@ -98,6 +108,7 @@ var ScrollView = React.createClass({
      * content is smaller than the scroll view bounds; when the content is
      * larger than the scroll view, this property has no effect. The default
      * value is false.
+     * @platform ios
      */
     centerContent: PropTypes.bool,
     /**
@@ -121,6 +132,7 @@ var ScrollView = React.createClass({
      * decelerates after the user lifts their finger. Reasonable choices include
      *   - Normal: 0.998 (the default)
      *   - Fast: 0.9
+     * @platform ios
      */
     decelerationRate: PropTypes.number,
     /**
@@ -131,17 +143,19 @@ var ScrollView = React.createClass({
     /**
      * When true, the ScrollView will try to lock to only vertical or horizontal
      * scrolling while dragging.  The default value is false.
+     * @platform ios
      */
     directionalLockEnabled: PropTypes.bool,
     /**
      * When false, once tracking starts, won't try to drag if the touch moves.
      * The default value is true.
+     * @platform ios
      */
     canCancelContentTouches: PropTypes.bool,
     /**
      * Determines whether the keyboard gets dismissed in response to a drag.
      *   - 'none' (the default), drags do not dismiss the keyboard.
-     *   - 'onDrag', the keyboard is dismissed when a drag begins.
+     *   - 'on-drag', the keyboard is dismissed when a drag begins.
      *   - 'interactive', the keyboard is dismissed interactively with the drag
      *     and moves in synchrony with the touch; dragging upwards cancels the
      *     dismissal.
@@ -156,35 +170,83 @@ var ScrollView = React.createClass({
      * is up dismisses the keyboard. When true, the scroll view will not catch
      * taps, and the keyboard will not dismiss automatically. The default value
      * is false.
+     * @platform ios
      */
     keyboardShouldPersistTaps: PropTypes.bool,
     /**
      * The maximum allowed zoom scale. The default value is 1.0.
+     * @platform ios
      */
     maximumZoomScale: PropTypes.number,
     /**
      * The minimum allowed zoom scale. The default value is 1.0.
+     * @platform ios
      */
     minimumZoomScale: PropTypes.number,
+    /**
+     * Fires at most once per frame during scrolling. The frequency of the
+     * events can be contolled using the `scrollEventThrottle` prop.
+     */
+    onScroll: PropTypes.func,
+    /**
+     * Called when a scrolling animation ends.
+     * @platform ios
+     */
+    onScrollAnimationEnd: PropTypes.func,
     /**
      * When true, the scroll view stops on multiples of the scroll view's size
      * when scrolling. This can be used for horizontal pagination. The default
      * value is false.
+     * @platform ios
      */
     pagingEnabled: PropTypes.bool,
+    /**
+     * When false, the content does not scroll.
+     * The default value is true.
+     * @platform ios
+     */
+    scrollEnabled: PropTypes.bool,
+    /**
+     * This controls how often the scroll event will be fired while scrolling
+     * (in events per seconds). A higher number yields better accuracy for code
+     * that is tracking the scroll position, but can lead to scroll performance
+     * problems due to the volume of information being send over the bridge.
+     * The default value is zero, which means the scroll event will be sent
+     * only once each time the view is scrolled.
+     * @platform ios
+     */
+    scrollEventThrottle: PropTypes.number,
+    /**
+     * The amount by which the scroll view indicators are inset from the edges
+     * of the scroll view. This should normally be set to the same value as
+     * the `contentInset`. Defaults to `{0, 0, 0, 0}`.
+     * @platform ios
+     */
+    scrollIndicatorInsets: EdgeInsetsPropType,
     /**
      * When true, the scroll view scrolls to top when the status bar is tapped.
      * The default value is true.
+     * @platform ios
      */
     scrollsToTop: PropTypes.bool,
+    /**
+     * When true, shows a horizontal scroll indicator.
+     */
+    showsHorizontalScrollIndicator: PropTypes.bool,
+    /**
+     * When true, shows a vertical scroll indicator.
+     */
+    showsVerticalScrollIndicator: PropTypes.bool,
     /**
      * An array of child indices determining which children get docked to the
      * top of the screen when scrolling. For example, passing
      * `stickyHeaderIndices={[0]}` will cause the first child to be fixed to the
      * top of the scroll view. This property is not supported in conjunction
      * with `horizontal={true}`.
+     * @platform ios
      */
     stickyHeaderIndices: PropTypes.arrayOf(PropTypes.number),
+    style: StyleSheetPropType(ViewStylePropTypes),
     /**
      * Experimental: When true, offscreen child views (whose `overflow` value is
      * `hidden`) are removed from their native backing superview when offscreen.
@@ -194,6 +256,7 @@ var ScrollView = React.createClass({
     removeClippedSubviews: PropTypes.bool,
     /**
      * The current scale of the scroll view content. The default value is 1.0.
+     * @platform ios
      */
     zoomScale: PropTypes.number,
   },