Add a command-line flag to set GPU rasterization multisampling.

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 318 matching lines @@
     DISALLOW_COPY_AND_ASSIGN(ScopedWriteLockGpuMemoryBuffer);
   };
 
   class CC_EXPORT ScopedWriteLockGr {
    public:
     ScopedWriteLockGr(ResourceProvider* resource_provider,
                       ResourceProvider::ResourceId resource_id);
     ~ScopedWriteLockGr();
 
     SkSurface* GetSkSurface(bool use_distance_field_text,
-                            bool can_use_lcd_text);
+                            bool can_use_lcd_text,
+                            int msaa_sample_count);
 
    private:
     bool SurfaceHasMatchingProperties(bool use_distance_field_text,
                                       bool can_use_lcd_text) const;
 
     ResourceProvider* resource_provider_;
     ResourceProvider::Resource* resource_;
     base::ThreadChecker thread_checker_;
 
     DISALLOW_COPY_AND_ASSIGN(ScopedWriteLockGr);
@@ skipping 301 matching lines @@
   return format_gl_data_format[format];
 }
 
 inline GLenum GLInternalFormat(ResourceFormat format) {
   return GLDataFormat(format);
 }
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RESOURCE_PROVIDER_H_