Use MSAA in GPU rasterization if Skia suggests it

cc/base/switches.h

 // Copyright (c) 2012 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.
 
 // Defines all the "cc" command-line switches.
 
 #ifndef CC_BASE_SWITCHES_H_
 #define CC_BASE_SWITCHES_H_
 
 #include "cc/base/cc_export.h"
@@ skipping 54 matching lines @@
 CC_EXPORT extern const char kUIShowOccludingRects[];
 CC_EXPORT extern const char kShowNonOccludingRects[];
 CC_EXPORT extern const char kUIShowNonOccludingRects[];
 
 // Unit test related.
 CC_EXPORT extern const char kCCLayerTreeTestNoTimeout[];
 CC_EXPORT extern const char kCCRebaselinePixeltests[];
 
 CC_EXPORT bool IsLCDTextEnabled();
 CC_EXPORT bool IsGpuRasterizationEnabled();
+enum GpuRasterizationType {
+  GpuRasterizationGpu,
+  GpuRasterizationMsaa4,
+  GpuRasterizationMsaa16
+};
+CC_EXPORT GpuRasterizationType GetGpuRasterizationType();
 CC_EXPORT bool IsImplSidePaintingEnabled();
 CC_EXPORT bool IsMapImageEnabled();
 
 }  // namespace switches
 }  // namespace cc
 
 #endif  // CC_BASE_SWITCHES_H_