Add ArcNotificationManager for new ARC notification

components/arc/BUILD.gn

Index: components/arc/BUILD.gn
diff --git a/components/arc/BUILD.gn b/components/arc/BUILD.gn
index 4f96906afccc50e2b64bb596e579912cac3b37be..f01aedc659756ce85924409783cf5ae2241e462f 100644
--- a/components/arc/BUILD.gn
+++ b/components/arc/BUILD.gn
@@ -17,6 +17,10 @@ static_library("arc") {
     "input/arc_input_bridge.h",
     "input/arc_input_bridge_impl.cc",
     "input/arc_input_bridge_impl.h",
+    "notification/arc_notification_item.cc",
+    "notification/arc_notification_item.h",
+    "notification/arc_notification_manager.cc",
+    "notification/arc_notification_manager.h",
     "settings/arc_settings_bridge.cc",
     "settings/arc_settings_bridge.h",
   ]
@@ -25,12 +29,17 @@ static_library("arc") {
     "//base",
     "//base:prefs",
     "//chromeos",
+    "//components/signin/core/account_id",
+    "//content/public/browser",
+    "//content/public/child",
     "//ipc:ipc",
     "//ipc/mojo:mojo",
     "//third_party/mojo/src/mojo/edk/system",
     "//ui/aura",
     "//ui/events",
     "//ui/events:dom_keycode_converter",
+    "//ui/gfx",
+    "//ui/message_center",
   ]
 
   public_deps = [