Use Point, Size, and Rect in layout2.dart

sky/sdk/lib/framework/app.dart

Index: sky/sdk/lib/framework/app.dart
diff --git a/sky/sdk/lib/framework/app.dart b/sky/sdk/lib/framework/app.dart
index 6250fe40d2b9a65b866ae9f2238783a552da1331..37d9c379ca155fe79ba69c8fdbbbbb3b3857a3d8 100644
--- a/sky/sdk/lib/framework/app.dart
+++ b/sky/sdk/lib/framework/app.dart
@@ -41,7 +41,7 @@ class AppView {
     switch(event.type) {
       case 'pointerdown':
         result = new HitTestResult();
-        _renderView.hitTest(result, x: event.x, y: event.y);
+        _renderView.hitTest(result, position: new sky.Point(event.x, event.y));
         _hitTestResultForPointer[event.pointer] = result;
         break;
       case 'pointerup':