Enable antialiasing on Paint by default.

sky/engine/core/painting/Paint.cpp

 // 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.
 
 #include "sky/engine/config.h"
 #include "sky/engine/core/painting/Paint.h"
 
 #include "sky/engine/core/painting/ColorFilter.h"
 #include "sky/engine/core/painting/DrawLooper.h"
 #include "sky/engine/core/painting/MaskFilter.h"
 #include "sky/engine/core/painting/Shader.h"
 
 namespace blink {
 
 Paint::Paint()
 {
+    setIsAntiAlias(true);
 }
 
 Paint::~Paint()
 {
 }
 
 void Paint::setDrawLooper(DrawLooper* looper)
 {
     ASSERT(looper);
     m_paint.setLooper(looper->looper());
@@ skipping 21 matching lines @@
 {
     m_paint.setStyle(style);
 }
 
 void Paint::setTransferMode(SkXfermode::Mode transfer_mode)
 {
     m_paint.setXfermodeMode(transfer_mode);
 }
 
 } // namespace blink