ozone: Allocate scanout buffer according to KMS modifiers

ui/ozone/platform/drm/gpu/hardware_display_controller.cc

Index: ui/ozone/platform/drm/gpu/hardware_display_controller.cc
diff --git a/ui/ozone/platform/drm/gpu/hardware_display_controller.cc b/ui/ozone/platform/drm/gpu/hardware_display_controller.cc
index c45ed81146759ef83c64fe507846e9ef399d2ea8..3f0db8d94f0670e1a3a691dc46a6c61868eee553 100644
--- a/ui/ozone/platform/drm/gpu/hardware_display_controller.cc
+++ b/ui/ozone/platform/drm/gpu/hardware_display_controller.cc
@@ -143,6 +143,16 @@ bool HardwareDisplayController::IsFormatSupported(uint32_t fourcc_format,
   return true;
 }
 
+uint32_t HardwareDisplayController::GetFormatModifiers(uint32_t format,
+						       uint64_t *modifiers, uint32_t count) {
+  // TODO(hoegsberg): We need to intersect modifiers from different
+  // controllers here.
+  for (const auto& controller : crtc_controllers_)
+    count = controller->GetFormatModifiers(format, modifiers, count);
+
+  return count;
+}
+
 bool HardwareDisplayController::SetCursor(
     const scoped_refptr<ScanoutBuffer>& buffer) {
   bool status = true;