Rename watchPerformance to watch

sky/sdk/example/stocks/lib/stock_home.dart

Index: sky/sdk/example/stocks/lib/stock_home.dart
diff --git a/sky/sdk/example/stocks/lib/stock_home.dart b/sky/sdk/example/stocks/lib/stock_home.dart
index 9dbf26f4f9d0333a163b490c78eeb9ee03bcde47..9115736cc88276fb38a3578f90c6eae37d672579 100644
--- a/sky/sdk/example/stocks/lib/stock_home.dart
+++ b/sky/sdk/example/stocks/lib/stock_home.dart
@@ -286,7 +286,7 @@ class StockHome extends AnimatedComponent {
         ..position = new AnimatedType<Point>(const Point(0.0, 45.0), end: Point.origin);
       var performance = _snackbarTransform.createPerformance(
           [_snackbarTransform.position], duration: _kSnackbarSlideDuration);
-      watchPerformance(performance);
+      watch(performance);
       performance.play();
     });
   }