Convert some GN test support targets to static libs.

ui/display/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/ui.gni")
 import("//testing/test.gni")
 
 component("display") {
   sources = [
     "android/screen_android.cc",
@@ skipping 122 matching lines @@
     ]
     deps = [
       "//base",
       "//ui/display/types",
       "//ui/gfx",
       "//ui/gfx/geometry",
     ]
   }
 }
 
-source_set("test_support") {
+static_library("test_support") {
   testonly = true
   sources = [
     "chromeos/test/action_logger.cc",
     "chromeos/test/action_logger.h",
     "chromeos/test/action_logger_util.cc",
     "chromeos/test/action_logger_util.h",
     "chromeos/test/test_display_layout_manager.cc",
     "chromeos/test/test_display_layout_manager.h",
     "chromeos/test/test_native_display_delegate.cc",
     "chromeos/test/test_native_display_delegate.h",
@@ skipping 64 matching lines @@
     sources -= [ "display_change_notifier_unittest.cc" ]
   }
 
   if (is_chromeos && use_ozone) {
     sources -= [
       "chromeos/x11/display_util_x11_unittest.cc",
       "chromeos/x11/native_display_event_dispatcher_x11_unittest.cc",
     ]
   }
 }