[Ozone-GBM] Handle GPU crashes

ui/ozone/platform/dri/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")
 
 pkg_config("libdrm") {
   packages = [ "libdrm" ]
 }
@@ skipping 92 matching lines @@
   }
 }
 
 if (ozone_platform_gbm) {
   pkg_config("libgbm") {
     packages = [ "gbm" ]
   }
 
   source_set("gbm") {
     sources = [
+      "channel_observer.h",
       "chromeos/display_message_handler.cc",
       "chromeos/display_message_handler.h",
       "chromeos/native_display_delegate_proxy.cc",
       "chromeos/native_display_delegate_proxy.h",
       "dri_window_delegate_proxy.cc",
       "dri_window_delegate_proxy.h",
       "gbm_buffer.cc",
       "gbm_buffer.h",
       "gbm_buffer_base.cc",
       "gbm_buffer_base.h",
@@ skipping 16 matching lines @@
       "//base",
       "//skia",
       "//ui/events/ozone:events_ozone_evdev",
     ]
 
     direct_dependent_configs = [
       ":libgbm",
     ]
   }
 }