Rename all the things

sky/sdk/lib/painting/shadows.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;
 
 /// Helper class to build a Paint DrawLooper that adds shadows to the Paint's
 /// operation.
 class ShadowDrawLooperBuilder {
   var builder_ = new sky.LayerDrawLooperBuilder();
@@ skipping 11 matching lines @@
                                   blur,
                                   highQuality: true));
       });
   }
 
   sky.DrawLooper build() {
     builder_.addLayerOnTop(new sky.DrawLooperLayerInfo(), (_) {});
     return builder_.build();
   }
 }