Rename watchPerformance to watch

sky/sdk/lib/widgets/dismissable.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import 'dart:sky' as sky;
 
 import 'package:vector_math/vector_math.dart';
 import 'package:sky/animation/animation_performance.dart';
 import 'package:sky/widgets/animation_builder.dart';
 import 'package:sky/widgets/animated_component.dart';
@@ skipping 27 matching lines @@
 
   void initState() {
     _transform = new AnimationBuilder()
       ..position = new AnimatedType<Point>(Point.origin)
       ..opacity = new AnimatedType<double>(1.0, end: 0.0);
 
     _performance = _transform.createPerformance(
         [_transform.position, _transform.opacity],
         duration: new Duration(milliseconds: _kCardDismissFadeoutMS));
     _performance.addListener(_handleAnimationProgressChanged);
-    watchPerformance(_performance);
+    watch(_performance);
   }
 
   void syncFields(Dismissable source) {
     child = source.child;
     onDismissed = source.onDismissed;
     super.syncFields(source);
   }
 
   Point get _activeCardDragEndPoint {
     assert(_width != null);
@@ skipping 97 matching lines @@
       onPointerUp: _handlePointerUpOrCancel,
       onPointerCancel: _handlePointerUpOrCancel,
       onGestureFlingStart: _handleFlingStart,
       child: new SizeObserver(
         child: transformedChild,
         callback: _handleSizeChanged
       )
     );
   }
 }