Implement GLX for Ozone X11.

ui/ozone/public/surface_factory_ozone.h

Index: ui/ozone/public/surface_factory_ozone.h
diff --git a/ui/ozone/public/surface_factory_ozone.h b/ui/ozone/public/surface_factory_ozone.h
index dc3a07e2b6abdc0ea47dd6ccf4cc4505071f7252..90017646d4810c80f759da1737e8167495f43381 100644
--- a/ui/ozone/public/surface_factory_ozone.h
+++ b/ui/ozone/public/surface_factory_ozone.h
@@ -115,6 +115,9 @@ class OZONE_BASE_EXPORT SurfaceFactoryOzone {
       gfx::BufferFormat format,
       const gfx::NativePixmapHandle& handle);
 
+  // Returns true if the Ozone platform supports GLX.

[rjkroege, 2016/04/27 19:08:12]

I think that I'm opposed to introducing this into the top-level API. It is a
platform-specific detail that should ideally be abstracted.

[kylechar, 2016/04/27 19:36:32]

Yes, I think that is the better approach. There is a way to do it but it
requires big refactoring, see my other comment.

+  virtual bool SupportsGLX();
+
  protected:
   SurfaceFactoryOzone();
   virtual ~SurfaceFactoryOzone();