Start of display management for mus

components/mus/ws/display_manager.cc

Index: components/mus/ws/display_manager.cc
diff --git a/components/mus/ws/display_manager.cc b/components/mus/ws/display_manager.cc
index e38e1d463b4c30fc8ad5ee97b912fefd98a48d04..205a650638f277782faf588fb3f4fb7b76097c0a 100644
--- a/components/mus/ws/display_manager.cc
+++ b/components/mus/ws/display_manager.cc
@@ -254,6 +254,11 @@ const mojom::ViewportMetrics& DefaultDisplayManager::GetViewportMetrics() {
   return metrics_;
 }
 
+mojom::Rotation DefaultDisplayManager::GetRotation() {
+  // TODO(sky): implement me.
+  return mojom::Rotation::VALUE_0;
+}
+
 void DefaultDisplayManager::UpdateTextInputState(
     const ui::TextInputState& state) {
   ui::PlatformImeController* ime = platform_window_->GetPlatformImeController();