Enable WebUI ScreenLocker for aura by abstracting lock window.

chrome/chrome_browser.gypi

Index: chrome/chrome_browser.gypi
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index 6705cff10cf1030837968e5b0e49ebfa6cea94df..65d797659ae762dd975774ae6bc23d614c6563e6 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -580,6 +580,12 @@
         'browser/chromeos/login/language_switch_menu.h',
         'browser/chromeos/login/session_manager_observer.cc',
         'browser/chromeos/login/session_manager_observer.h',
+        'browser/chromeos/login/lock_window.cc',
+        'browser/chromeos/login/lock_window.h',
+        'browser/chromeos/login/lock_window_aura.cc',
+        'browser/chromeos/login/lock_window_aura.h',
+        'browser/chromeos/login/lock_window_gtk.cc',
+        'browser/chromeos/login/lock_window_gtk.h',
         'browser/chromeos/login/login_display.cc',
         'browser/chromeos/login/login_display.h',
         'browser/chromeos/login/login_display_host.h',
@@ -5135,21 +5141,18 @@
         # Build Aura with ChromeOS.
         ['use_aura==1 and chromeos==1', {
           'sources/': [
-            ['exclude', '^browser/chromeos/browser/chromeos/login/screen_locker.cc'],
             ['exclude', '^browser/chromeos/frame/'],
             ['exclude', '^browser/chromeos/legacy_window_manager/wm_ipc.cc'],
             ['exclude', '^browser/chromeos/legacy_window_manager/wm_message_listener.cc'],
             ['exclude', '^browser/chromeos/login/background_view.cc'],
             ['exclude', '^browser/chromeos/login/screen_locker_browsertest.cc'],
             ['exclude', '^browser/chromeos/login/screen_locker_views.cc'],
-            ['exclude', '^browser/chromeos/login/screen_locker.cc'],
             ['exclude', '^browser/chromeos/login/screen_lock_view.cc'],
             ['exclude', '^browser/chromeos/login/shutdown_button.cc'],
             ['exclude', '^browser/chromeos/login/username_view.cc'],
             ['exclude', '^browser/chromeos/login/user_view.cc'],
             ['exclude', '^browser/chromeos/login/views_login_display.cc'],
             ['exclude', '^browser/chromeos/login/views_login_display_host.cc'],
-            ['exclude', '^browser/chromeos/login/webui_screen_locker.cc'],
             ['exclude', '^browser/chromeos/login/wizard_in_process_browser_test.cc'],
             ['exclude', '^browser/chromeos/notifications/'],
             ['include', '^browser/ui/views/handle_web_keyboard_event_aura.cc'],