chromeos: decode video into NV12 format instead of RGBA in vaapi decoder

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

Index: ui/ozone/platform/drm/gpu/gbm_buffer.cc
diff --git a/ui/ozone/platform/drm/gpu/gbm_buffer.cc b/ui/ozone/platform/drm/gpu/gbm_buffer.cc
index 7081e847582ee2a9d273ead30f883e2f89eb39d8..f70099aaa986a570756d9958358276e9d35854a8 100644
--- a/ui/ozone/platform/drm/gpu/gbm_buffer.cc
+++ b/ui/ozone/platform/drm/gpu/gbm_buffer.cc
@@ -360,6 +360,10 @@ gfx::BufferFormat GbmPixmap::GetBufferFormat() const {
   return ui::GetBufferFormatFromFourCCFormat(buffer_->GetFormat());
 }
 
+gfx::BufferUsage GbmPixmap::GetBufferUsage() const {
+  return ui::GetBufferUsageFromGbmFlags(buffer_->GetFlags());
+}
+
 gfx::Size GbmPixmap::GetBufferSize() const {
   return buffer_->GetSize();
 }