Add initial support for native Linux desktop notifications

chrome/browser/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/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 3736 matching lines @@
     }
 
     # libsecret hard depends on GLib.
     if (use_glib) {
       sources += [
         "password_manager/native_backend_libsecret.cc",
         "password_manager/native_backend_libsecret.h",
       ]
       defines += [ "USE_LIBSECRET" ]
       deps += [ "//third_party/libsecret" ]
+      if (use_gio) {
+        sources += [
+          "notifications/notification_platform_bridge_linux.cc",
+          "notifications/notification_platform_bridge_linux.h",
+        ]
+        deps += [ "//build/linux/libgio" ]
+      }
     }
 
     if (use_ozone) {
       sources += [
         "fullscreen_ozone.cc",
         "media/webrtc/window_icon_util_ozone.cc",
       ]
     }
   }
 
@@ skipping 865 matching lines @@
       "media/pepper_cdm_test_constants.cc",
       "media/pepper_cdm_test_constants.h",
     ]
   }
 }
 
 service_manifest("preferences_forwarder_manifest") {
   name = "preferences_forwarder"
   source = "prefs/forwarder_manifest.json"
 }