Add unittests of ArcCustomNotificationView

ui/arc/BUILD.gn

Index: ui/arc/BUILD.gn
diff --git a/ui/arc/BUILD.gn b/ui/arc/BUILD.gn
index 1f9a43fa7def4017d57daf8c26277aa737b99ee3..5786fc4f86971c52c7abb1a7cb811a03af803f38 100644
--- a/ui/arc/BUILD.gn
+++ b/ui/arc/BUILD.gn
@@ -16,8 +16,13 @@ static_library("arc") {
     "notification/arc_notification_item_impl.h",
     "notification/arc_notification_manager.cc",
     "notification/arc_notification_manager.h",
+    "notification/arc_notification_surface.h",
+    "notification/arc_notification_surface_impl.cc",
+    "notification/arc_notification_surface_impl.h",
     "notification/arc_notification_surface_manager.cc",
     "notification/arc_notification_surface_manager.h",
+    "notification/arc_notification_surface_manager_impl.cc",
+    "notification/arc_notification_surface_manager_impl.h",
     "notification/arc_notification_view.cc",
     "notification/arc_notification_view.h",
   ]
@@ -48,6 +53,7 @@ static_library("arc") {
 test("ui_arc_unittests") {
   testonly = true
   sources = [
+    "notification/arc_custom_notification_view_unittest.cc",
     "notification/arc_notification_manager_unittest.cc",
     "notification/arc_notification_view_unittest.cc",
     "test/run_all_unittests.cc",
@@ -61,8 +67,6 @@ test("ui_arc_unittests") {
     "//mojo/edk/system",
     "//testing/gtest",
     "//ui/base:test_support",
-    "//ui/base/ime",
-    "//ui/events",
     "//ui/events:test_support",
     "//ui/gl:test_support",
     "//ui/message_center:test_support",