Add a "Max. MSAA samples" entry to chrome://gpu.

gpu/config/gpu_info.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.
 
 #ifndef GPU_CONFIG_GPU_INFO_H_
 #define GPU_CONFIG_GPU_INFO_H_
 
 // Provides access to the GPU information for the system
 // on which chrome is currently running.
 
@@ skipping 120 matching lines @@
 
   // The date of the graphics driver currently installed.
   std::string driver_date;
 
   // The version of the pixel/fragment shader used by the gpu.
   std::string pixel_shader_version;
 
   // The version of the vertex shader used by the gpu.
   std::string vertex_shader_version;
 
+  // The maximum multisapling sample count, either through ES3 or
+  // EXT_multisampled_render_to_texture MSAA.
+  std::string max_msaa_samples;
+
   // The machine model identifier. They can contain any character, including
   // whitespaces.  Currently it is supported on MacOSX and Android.
   // Android examples: "Naxus 5", "XT1032".
   // On MacOSX, the version is stripped out of the model identifier, for
   // example, the original identifier is "MacBookPro7,2", and we put
   // "MacBookPro" as machine_model_name, and "7.2" as machine_model_version.
   std::string machine_model_name;
 
   // The version of the machine model. Currently it is supported on MacOSX.
   // See machine_model_name's comment.
@@ skipping 91 matching lines @@
     virtual ~Enumerator() {}
   };
 
   // Outputs the fields in this structure to the provided enumerator.
   void EnumerateFields(Enumerator* enumerator) const;
 };
 
 }  // namespace gpu
 
 #endif  // GPU_CONFIG_GPU_INFO_H_