[WIP] Move ownership of PlatformDisplay from ws::Display to ws::WindowServer

services/ui/ws/window_server.cc

Index: services/ui/ws/window_server.cc
diff --git a/services/ui/ws/window_server.cc b/services/ui/ws/window_server.cc
index 4a2cb7d666377afd90156bd1183b542e4877b8d9..14ae8110e4d51a3ddb72b78de338cfef09bbad11 100644
--- a/services/ui/ws/window_server.cc
+++ b/services/ui/ws/window_server.cc
@@ -549,6 +549,20 @@ bool WindowServer::GetFrameDecorationsForUser(
   return window_manager_state->got_frame_decoration_values();
 }
 
+void WindowServer::AddPlatformDisplay(
+    std::unique_ptr<PlatformDisplay> platform_display) {
+  platform_displays_.insert(std::move(platform_display));
+}
+
+void WindowServer::RemovePlatformDisplay(PlatformDisplay* platform_display) {
+  for (auto& pd : platform_displays_) {
+    if (pd.get() == platform_display) {
+      platform_displays_.erase(pd);
+      break;
+    }
+  }
+}
+
 bool WindowServer::GetAndClearInFlightWindowManagerChange(
     uint32_t window_manager_change_id,
     InFlightWindowManagerChange* change) {