Enable WebUI ScreenLocker for aura by abstracting lock window.

chrome/browser/chromeos/login/screen_locker.cc

Index: chrome/browser/chromeos/login/screen_locker.cc
diff --git a/chrome/browser/chromeos/login/screen_locker.cc b/chrome/browser/chromeos/login/screen_locker.cc
index c16da7116b32072ce65e7e46916f58fba96bba5d..e8c21da8c1c2d4e4c6e01add2c739a4a0085befc 100644
--- a/chrome/browser/chromeos/login/screen_locker.cc
+++ b/chrome/browser/chromeos/login/screen_locker.cc
@@ -27,7 +27,6 @@
 #include "chrome/browser/chromeos/login/authenticator.h"
 #include "chrome/browser/chromeos/login/login_performer.h"
 #include "chrome/browser/chromeos/login/login_utils.h"
-#include "chrome/browser/chromeos/login/screen_locker_views.h"
 #include "chrome/browser/chromeos/login/user_manager.h"
 #include "chrome/browser/chromeos/login/webui_screen_locker.h"
 #include "chrome/browser/profiles/profile.h"
@@ -50,6 +49,10 @@
 #include "chrome/browser/chromeos/legacy_window_manager/wm_ipc.h"
 #endif
 
+#if !defined(USE_AURA)
+#include "chrome/browser/chromeos/login/screen_locker_views.h"
+#endif
+
 using content::BrowserThread;
 
 namespace {
@@ -201,10 +204,14 @@ ScreenLocker::ScreenLocker(const User& user)
 
 void ScreenLocker::Init() {
   authenticator_ = LoginUtils::Get()->CreateAuthenticator(this);
+#if defined(USE_AURA)
+  delegate_.reset(new WebUIScreenLocker(this));
+#else
   if (UseWebUILockScreen())
     delegate_.reset(new WebUIScreenLocker(this));
   else
     delegate_.reset(new ScreenLockerViews(this));
+#endif
   delegate_->LockScreen(unlock_on_input_);
 }
 
@@ -405,8 +412,12 @@ void ScreenLocker::UnlockScreenFailed() {
 
 // static
 bool ScreenLocker::UseWebUILockScreen() {
+#if defined(USE_AURA)
+  return true;
+#else
   return !CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kDisableWebUILockScreen);
+#endif
 }
 
 // static