Convert some GN test support targets to static libs.

ui/events/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")
 import("//ui/ozone/ozone.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
@@ skipping 249 matching lines @@
 
   if (is_android) {
     sources += [ "gesture_detection/gesture_configuration_android.cc" ]
   } else if (use_aura) {
     sources += [ "gesture_detection/gesture_configuration_aura.cc" ]
   } else {
     sources += [ "gesture_detection/gesture_configuration_default.cc" ]
   }
 }
 
-source_set("test_support") {
+static_library("test_support") {
   sources = [
     "test/cocoa_test_event_utils.h",
     "test/cocoa_test_event_utils.mm",
     "test/device_data_manager_test_api.h",
     "test/event_generator.cc",
     "test/event_generator.h",
     "test/events_test_utils.cc",
     "test/events_test_utils.h",
     "test/motion_event_test_utils.cc",
     "test/motion_event_test_utils.h",
@@ skipping 189 matching lines @@
   generate_jar_jni("motionevent_jni_headers") {
     jni_package = "ui"
     classes = [ "android/view/MotionEvent.class" ]
   }
 
   generate_jar_jni("keyevent_jni_headers") {
     jni_package = "ui"
     classes = [ "android/view/KeyEvent.class" ]
   }
 }