Add GL_EXT_multisampled_render_to_texture support to command buffer.

gpu/command_buffer/service/feature_info.h

Index: gpu/command_buffer/service/feature_info.h
diff --git a/gpu/command_buffer/service/feature_info.h b/gpu/command_buffer/service/feature_info.h
index 87abfba9b91f42d9eaec4514f8f2ffe0d192428f..a9ccf64c00901907fd3162af6939efc6959c5400 100644
--- a/gpu/command_buffer/service/feature_info.h
+++ b/gpu/command_buffer/service/feature_info.h
@@ -27,6 +27,9 @@ class GPU_EXPORT FeatureInfo : public base::RefCounted<FeatureInfo> {
     FeatureFlags();
 
     bool chromium_framebuffer_multisample;
+    bool multisampled_render_to_texture;
+    // Use the IMG GLenum values and functions rather than EXT.
+    bool use_img_for_multisampled_render_to_texture;
     bool oes_standard_derivatives;
     bool oes_egl_image_external;
     bool npot_ok;