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

gpu/config/gpu_info.h

Index: gpu/config/gpu_info.h
diff --git a/gpu/config/gpu_info.h b/gpu/config/gpu_info.h
index e5bef2371de6fbe0e5d9768cb11fa0530670a316..cbd83617134bf8fc8074860a525e86c75e792870 100644
--- a/gpu/config/gpu_info.h
+++ b/gpu/config/gpu_info.h
@@ -138,6 +138,10 @@ struct GPU_EXPORT GPUInfo {
   // 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".