Propagate supported scanout formats from driver to SurfaceFactoryOzone.

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

Index: ui/ozone/platform/drm/gpu/drm_thread.h
diff --git a/ui/ozone/platform/drm/gpu/drm_thread.h b/ui/ozone/platform/drm/gpu/drm_thread.h
index 130b0dc4e332ad9c8ae428b8cd3bdedeb5678e77..6299b83752b4f3e0b94a43b7f777d77e9fcc620b 100644
--- a/ui/ozone/platform/drm/gpu/drm_thread.h
+++ b/ui/ozone/platform/drm/gpu/drm_thread.h
@@ -59,6 +59,7 @@ class DrmThread : public base::Thread {
                     gfx::BufferUsage usage,
                     scoped_refptr<GbmBuffer>* buffer);
 
+  void GetSupportedFormats(std::vector<uint32_t>* support_formats);

[spang, 2016/01/20 18:52:24]

Document what the uint32_t means.

In fact, could this API just use gfx::BufferFormat?

[william.xie, 2016/01/21 02:14:02]

Done.

   void SchedulePageFlip(gfx::AcceleratedWidget widget,
                         const std::vector<OverlayPlane>& planes,
                         const SwapCompletionCallback& callback);