Fix black screen when switching primary display without bounds change

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

Index: ui/ozone/platform/drm/gpu/gbm_buffer_base.cc
diff --git a/ui/ozone/platform/drm/gpu/gbm_buffer_base.cc b/ui/ozone/platform/drm/gpu/gbm_buffer_base.cc
index 97d16a071af956b415598762938799833f160cd9..96ae817a384466b06788163fe11aec9c03280d5b 100644
--- a/ui/ozone/platform/drm/gpu/gbm_buffer_base.cc
+++ b/ui/ozone/platform/drm/gpu/gbm_buffer_base.cc
@@ -57,6 +57,10 @@ uint32_t GbmBufferBase::GetFramebufferPixelFormat() const {
   return framebuffer_pixel_format_;
 }
 
+const DrmDevice* GbmBufferBase::GetDrmDevice() const {
+  return drm_.get();
+}
+
 bool GbmBufferBase::RequiresGlFinish() const {
   return !drm_->is_primary_device();
 }