mojo api for view based lockscreen

chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc

Index: chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc
diff --git a/chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc b/chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc
index e3367cc6e6974d55d5ee0029bb10c2dc9ec4980e..bf4759f39058798aa4f27a2305098729b88fb53c 100644
--- a/chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc
+++ b/chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc
@@ -19,6 +19,7 @@
 #include "chrome/browser/ui/ash/chrome_new_window_client.h"
 #include "chrome/browser/ui/ash/chrome_shell_content_state.h"
 #include "chrome/browser/ui/ash/launcher/chrome_launcher_controller.h"
+#include "chrome/browser/ui/ash/lock_screen_client_chromeos.h"
 #include "chrome/browser/ui/ash/media_client.h"
 #include "chrome/browser/ui/ash/session_controller_client.h"
 #include "chrome/browser/ui/ash/system_tray_client.h"
@@ -107,6 +108,7 @@ void ChromeBrowserMainExtraPartsAsh::PostProfileInit() {
   cast_config_client_media_router_ =
       base::MakeUnique<CastConfigClientMediaRouter>();
   media_client_ = base::MakeUnique<MediaClient>();
+  lock_screen_client_ = base::MakeUnique<LockScreenClientChromeOS>();
 
   if (!ash::Shell::HasInstance())
     return;
@@ -129,6 +131,7 @@ void ChromeBrowserMainExtraPartsAsh::PostMainMessageLoopRun() {
   media_client_.reset();
   cast_config_client_media_router_.reset();
   session_controller_client_.reset();
+  lock_screen_client_.reset();
 
   ash_init_.reset();
 }