ozone: Allocate scanout buffer according to KMS modifiers

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

Index: ui/ozone/platform/drm/gpu/crtc_controller.h
diff --git a/ui/ozone/platform/drm/gpu/crtc_controller.h b/ui/ozone/platform/drm/gpu/crtc_controller.h
index f332ce54da613cce9e2520be4ae71ff6669768d1..c3a7104b546749279e123b3aa890874d16a84753 100644
--- a/ui/ozone/platform/drm/gpu/crtc_controller.h
+++ b/ui/ozone/platform/drm/gpu/crtc_controller.h
@@ -58,6 +58,8 @@ class CrtcController : public base::SupportsWeakPtr<CrtcController> {
   // |fourcc_format| format.
   bool IsFormatSupported(uint32_t fourcc_format, uint32_t z_order) const;
 
+  std::vector<uint64_t> GetFormatModifiers(uint32_t format);

[Daniele Castagna, 2016/12/20 18:03:28]

nit: a comment explaining what a modifier for a format is would be nice. While
there, I'd also add that the format is a fourcc format. You can also change the
parameter name to fourcc_format to stay consistent with the method above.

[hoegsberg1, 2016/12/22 23:05:20]

Acknowledged.

+
   // Called if the page flip event wasn't scheduled (ie: page flip fails). This
   // will then signal the request such that the caller doesn't wait for the
   // event forever.