chromeos: Turn off displays on suspend

ui/ozone/platform/drm/host/drm_native_display_delegate.cc

Index: ui/ozone/platform/drm/host/drm_native_display_delegate.cc
diff --git a/ui/ozone/platform/drm/host/drm_native_display_delegate.cc b/ui/ozone/platform/drm/host/drm_native_display_delegate.cc
index 1563516b1075169db8f9889d686f8df9f332ebf0..14b4d0c59e3386912918a4c9f0ddffe6c1e4c2e8 100644
--- a/ui/ozone/platform/drm/host/drm_native_display_delegate.cc
+++ b/ui/ozone/platform/drm/host/drm_native_display_delegate.cc
@@ -54,6 +54,11 @@ void DrmNativeDisplayDelegate::SetBackgroundColor(uint32_t color_argb) {
 void DrmNativeDisplayDelegate::ForceDPMSOn() {
 }
 
+void DrmNativeDisplayDelegate::GetCachedDisplays(
+    const GetDisplaysCallback& callback) {
+  display_manager_->GetCachedDisplays(callback);
+}
+
 void DrmNativeDisplayDelegate::GetDisplays(
     const GetDisplaysCallback& callback) {
   display_manager_->UpdateDisplays(callback);