Fix 'gn check' errors in //ui/* targets.

ui/chromeos/BUILD.gn

Index: ui/chromeos/BUILD.gn
diff --git a/ui/chromeos/BUILD.gn b/ui/chromeos/BUILD.gn
index bcfaad4c6a9adf5452b103a9239431531d3022df..ea2fc20cf58b9d78a24c843eee54de4ee2588ca5 100644
--- a/ui/chromeos/BUILD.gn
+++ b/ui/chromeos/BUILD.gn
@@ -38,6 +38,7 @@ component("ui_chromeos") {
     "user_activity_power_manager_notifier.cc",
     "user_activity_power_manager_notifier.h",
   ]
+  defines = [ "UI_CHROMEOS_IMPLEMENTATION" ]
   deps = [
     "//base",
     "//base/third_party/dynamic_annotations",
@@ -53,10 +54,10 @@ component("ui_chromeos") {
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/message_center",
+    "//ui/native_theme",
     "//ui/views",
     "//ui/wm",
   ]
-  defines = [ "UI_CHROMEOS_IMPLEMENTATION" ]
 }
 
 test("ui_chromeos_unittests") {
@@ -77,6 +78,8 @@ test("ui_chromeos_unittests") {
     "//testing/gtest",
     "//ui/aura:test_support",
     "//ui/compositor",
+    "//ui/events:test_support",
+    "//ui/gl",
     "//ui/message_center",
     "//ui/resources:ui_test_pak",
     "//ui/views",