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 6f536e7bfc21570e2a62b3eb221240e2a0fe784e..cfaa57fec65c3e4a11c433c41a973d10db5d0ce8 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':
@@ -54,7 +54,7 @@ class AppView {
         // In the case of mouse hover we won't already have a cached down.
         if (result == null) {
           result = new HitTestResult();
-          _renderView.hitTest(result, x: event.x, y: event.y);
+          _renderView.hitTest(result, position: new sky.Point(event.x, event.y));
         }
         break;
     }