ozone: Add overlay candidate implementation that queries support via IPC

ui/ozone/platform/drm/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/linux/pkg_config.gni")
 import("//ui/ozone/ozone.gni")
 
 declare_args() {
   use_mesa_platform_null = false
   use_drm_atomic = false
@@ skipping 53 matching lines @@
     "gpu/screen_manager.h",
     "host/channel_observer.h",
     "host/drm_cursor.cc",
     "host/drm_cursor.h",
     "host/drm_device_handle.cc",
     "host/drm_device_handle.h",
     "host/drm_display_host_manager.cc",
     "host/drm_display_host_manager.h",
     "host/drm_gpu_platform_support_host.cc",
     "host/drm_gpu_platform_support_host.h",
+    "host/drm_host_overlay_candidates.cc",
+    "host/drm_host_overlay_candidates.h",
     "host/drm_native_display_delegate.cc",
     "host/drm_native_display_delegate.h",
     "host/drm_overlay_manager.cc",
     "host/drm_overlay_manager.h",
     "host/drm_window_host.cc",
     "host/drm_window_host.h",
     "host/drm_window_host_manager.cc",
     "host/drm_window_host_manager.h",
   ]
 
@@ skipping 100 matching lines @@
     public_configs = [
       ":libgbm",
       "//third_party/khronos:khronos_headers",
     ]
 
     if (use_mesa_platform_null) {
       defines += [ "USE_MESA_PLATFORM_NULL" ]
     }
   }
 }