Add an XPC service to handle alert notifications on mac

chrome/BUILD.gn

Index: chrome/BUILD.gn
diff --git a/chrome/BUILD.gn b/chrome/BUILD.gn
index 268328b6710a39f18f7404924e3ba3402d5cf181..ce1c5324740dce6d7e539dcc18d844b486340169 100644
--- a/chrome/BUILD.gn
+++ b/chrome/BUILD.gn
@@ -472,6 +472,22 @@ if (is_win) {
     }
   }
 
+  if (enable_xpc_notifications) {
+    bundle_data("chrome_framework_services") {
+      sources = [
+        "$root_out_dir/AlertNotificationService.xpc",
+      ]
+
+      outputs = [
+        "{{bundle_root_dir}}/XPCServices/{{source_file_part}}",
+      ]
+
+      public_deps = [
+        "//chrome/browser/ui/cocoa/notifications:alert_notification_xpc_service",
+      ]
+    }
+  }
+
   tweak_info_plist("chrome_app_plist") {
     info_plist = "app/app-Info.plist"
     _keystone_arg = "0"
@@ -1002,6 +1018,10 @@ if (is_win) {
       deps += [ ":default_apps" ]
     }
 
+    if (enable_xpc_notifications) {
+      deps += [ ":chrome_framework_services" ]
+    }
+
     ldflags = [
       "-Wl,-install_name,@executable_path/../Versions/$chrome_version_full/$chrome_framework_name.framework/$chrome_framework_name",
       "-compatibility_version",