Propagate supported scanout formats from driver to SurfaceFactoryOzone.

ui/ozone/platform/drm/gpu/drm_thread_proxy.h

Index: ui/ozone/platform/drm/gpu/drm_thread_proxy.h
diff --git a/ui/ozone/platform/drm/gpu/drm_thread_proxy.h b/ui/ozone/platform/drm/gpu/drm_thread_proxy.h
index 05e4b53003922fcb91ba21c20678b65896897c5b..e603662a2c9d700b91224b086efcd6f5ce4856e0 100644
--- a/ui/ozone/platform/drm/gpu/drm_thread_proxy.h
+++ b/ui/ozone/platform/drm/gpu/drm_thread_proxy.h
@@ -33,6 +33,9 @@ class DrmThreadProxy {
                                         gfx::BufferFormat format,
                                         gfx::BufferUsage usage);
 
+  void GetScanoutFormats(gfx::AcceleratedWidget widget,
+                         std::vector<gfx::BufferFormat>* scanout_formats);
+
  private:
   DrmThread drm_thread_;