cc: GPU rasterize to an auxiliary surface when using MSAA renderbuffers

gpu/command_buffer/common/capabilities.h

Index: gpu/command_buffer/common/capabilities.h
diff --git a/gpu/command_buffer/common/capabilities.h b/gpu/command_buffer/common/capabilities.h
index b01ccb8c91302316f4fc5eb2e0c7f6330542046b..7e71f08dee9afdacfcba9e9b4496d6efb02e9cd6 100644
--- a/gpu/command_buffer/common/capabilities.h
+++ b/gpu/command_buffer/common/capabilities.h
@@ -144,6 +144,8 @@ struct GPU_EXPORT Capabilities {
   bool surfaceless;
   bool flips_vertically;
   bool msaa_is_slow;
+  bool multisampled_render_to_texture;
+  bool chromium_framebuffer_mixed_samples;

[piman, 2016/04/14 22:45:03]

For these to work (across processes), you also need to add them to
gpu/ipc/common/gpu_command_buffer_traits_multi.h

 
   int major_version;
   int minor_version;