Rename RenderCanvas to PaintingCanvas to avoid confusion with other classes that inherit from Rende…

sky/sdk/lib/widgets/ink_well.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:math' as math;
 import 'dart:sky' as sky;
 
 import '../animation/animated_value.dart';
 import '../animation/curves.dart';
 import '../rendering/box.dart';
@@ skipping 34 matching lines @@
       return;
     _radius.animateTo(_targetRadius, duration, curve: easeOut);
   }
 
   void _handleRadiusChange() {
     if (_radius.value == _targetRadius)
       well._splashes.remove(this);
     well.markNeedsPaint();
   }
 
-  void paint(RenderCanvas canvas) {
+  void paint(PaintingCanvas canvas) {
     int opacity = (_kSplashInitialOpacity * (1.0 - (_radius.value / _targetRadius))).floor();
     sky.Paint paint = new sky.Paint()..color = new sky.Color(opacity << 24);
     canvas.drawCircle(position, _radius.value, paint);
   }
 }
 
 class RenderInkWell extends RenderProxyBox {
   RenderInkWell({ RenderBox child }) : super(child);
 
   final List<InkSplash> _splashes = new List<InkSplash>();
@@ skipping 15 matching lines @@
     _splashes.add(new InkSplash(pointer, position, this));
     markNeedsPaint();
   }
 
   void _confirmSplash(int pointer) {
     _splashes.where((splash) => splash.pointer == pointer)
              .forEach((splash) { splash.confirm(); });
     markNeedsPaint();
   }
 
-  void paint(RenderCanvas canvas, Offset offset) {
+  void paint(PaintingCanvas canvas, Offset offset) {
     if (!_splashes.isEmpty) {
       canvas.save();
       canvas.translate(offset.dx, offset.dy);
       canvas.clipRect(Point.origin & size);
       for (InkSplash splash in _splashes)
         splash.paint(canvas);
       canvas.restore();
     }
     super.paint(canvas, offset);
   }
 }
 
 class InkWell extends OneChildRenderObjectWrapper {
   InkWell({ String key, Widget child })
     : super(key: key, child: child);
 
   RenderInkWell get root => super.root;
   RenderInkWell createNode() => new RenderInkWell();
 }