Propagate supported scanout formats from driver to SurfaceFactoryOzone.

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

Index: ui/ozone/platform/drm/gpu/drm_gpu_display_manager.h
diff --git a/ui/ozone/platform/drm/gpu/drm_gpu_display_manager.h b/ui/ozone/platform/drm/gpu/drm_gpu_display_manager.h
index 681a7cdec489163deaa3e978de022482aa48fe04..641286c249a2464babecc2690166841f60a5959f 100644
--- a/ui/ozone/platform/drm/gpu/drm_gpu_display_manager.h
+++ b/ui/ozone/platform/drm/gpu/drm_gpu_display_manager.h
@@ -29,6 +29,11 @@ class DrmGpuDisplayManager {
   // displays is refreshed.
   std::vector<DisplaySnapshot_Params> GetDisplays();
 
+  // Returns all scanout formats for |widget| representing a particular display
+  // controller or default display controller for kNullAcceleratedWidget.
+  void GetScanoutFormats(gfx::AcceleratedWidget widget,
+                         std::vector<gfx::BufferFormat>* scanout_formats);
+
   // Takes/releases the control of the DRM devices.
   bool TakeDisplayControl();
   void RelinquishDisplayControl();