Use MSAA in GPU rasterization if Skia suggests it

cc/resources/resource_provider.h

 // Copyright 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.
 
 #ifndef CC_RESOURCES_RESOURCE_PROVIDER_H_
 #define CC_RESOURCES_RESOURCE_PROVIDER_H_
 
 #include <deque>
 #include <set>
 #include <string>
@@ skipping 72 matching lines @@
 
   void DidLoseOutputSurface() { lost_output_surface_ = true; }
 
   int max_texture_size() const { return max_texture_size_; }
   ResourceFormat memory_efficient_texture_format() const {
     return use_rgba_4444_texture_format_ ? RGBA_4444 : best_texture_format_;
   }
   ResourceFormat best_texture_format() const { return best_texture_format_; }
   size_t num_resources() const { return resources_.size(); }
 
+  unsigned num_gpu_rasterization_samples(ResourceFormat) const;
+
   // Checks whether a resource is in use by a consumer.
   bool InUseByConsumer(ResourceId id);
 
   bool IsLost(ResourceId id);
   bool AllowOverlay(ResourceId id);
 
   // Producer interface.
 
   ResourceType default_resource_type() const { return default_resource_type_; }
   ResourceType GetResourceType(ResourceId id);
@@ skipping 596 matching lines @@
   return format_gl_data_format[format];
 }
 
 inline GLenum GLInternalFormat(ResourceFormat format) {
   return GLDataFormat(format);
 }
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RESOURCE_PROVIDER_H_