Export the new pointer event classes.

packages/flutter/lib/src/rendering/proxy_box.dart

@@ -14,7 +14,12 @@ import 'debug.dart';
 import 'object.dart';
 
 export 'package:flutter/src/painting/box_painter.dart';
-export 'package:flutter/gestures.dart' show InputEvent, PointerInputEvent;
+export 'package:flutter/gestures.dart' show
+  PointerEvent,
+  PointerDownEvent,
+  PointerMoveEvent,
+  PointerUpEvent,
+  PointerCancelEvent;
 
 /// A base class for render objects that resemble their children
 ///

packages/flutter/lib/src/widgets/basic.dart

@@ -43,7 +43,11 @@ export 'package:flutter/rendering.dart' show
     Path,
     PlainTextSpan,
     Point,
-    PointerInputEvent,
+    PointerCancelEvent,
+    PointerDownEvent,
+    PointerEvent,
+    PointerMoveEvent,
+    PointerUpEvent,
     RadialGradient,
     Rect,
     ScrollDirection,