Ozone: Dont hardcode format to YUV when using Overlay Composition.

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 23 matching lines @@
     "gpu/drm_device_generator.cc",
     "gpu/drm_device_generator.h",
     "gpu/drm_device_manager.cc",
     "gpu/drm_device_manager.h",
     "gpu/drm_display.cc",
     "gpu/drm_display.h",
     "gpu/drm_gpu_display_manager.cc",
     "gpu/drm_gpu_display_manager.h",
     "gpu/drm_gpu_platform_support.cc",
     "gpu/drm_gpu_platform_support.h",
+    "gpu/drm_overlay_candidate.cc",
+    "gpu/drm_overlay_candidate.h",
     "gpu/drm_thread.cc",
     "gpu/drm_thread.h",
     "gpu/drm_thread_message_proxy.cc",
     "gpu/drm_thread_message_proxy.h",
     "gpu/drm_thread_proxy.cc",
     "gpu/drm_thread_proxy.h",
     "gpu/drm_vsync_provider.cc",
     "gpu/drm_vsync_provider.h",
     "gpu/drm_window.cc",
     "gpu/drm_window.h",
@@ skipping 109 matching lines @@
 
   deps = [
     "//skia",
     "//testing/gtest",
     "//ui/gfx",
     "//ui/ozone",
   ]
 
   public_configs = [ ":libdrm" ]
 }