Set ShelfAlignment on supervised user creation page to BOTTOM_LOCKED

chrome/browser/chromeos/login/ui/webui_login_view.cc

 // 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.
 
 #include "chrome/browser/chromeos/login/ui/webui_login_view.h"
 
 #include "ash/common/focus_cycler.h"
 #include "ash/common/wm_shell.h"
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray.h"
@@ skipping 302 matching lines @@
 
 void WebUILoginView::OnPostponedShow() {
   set_is_hidden(false);
   OnLoginPromptVisible();
 }
 
 void WebUILoginView::SetStatusAreaVisible(bool visible) {
   if (!chrome::IsRunningInMash() &&
       ash::Shell::GetInstance()->HasPrimaryStatusArea()) {
     ash::SystemTray* tray = ash::Shell::GetInstance()->GetPrimarySystemTray();
-    tray->SetVisible(visible);
     tray->GetWidget()->SetOpacity(visible ? 1.0 : 0.0);

[jdufault, 2016/07/07 23:26:50]

I don't think this change should get reverted.

[Qiang(Joe) Xu, 2016/07/08 00:18:40]

done. tks.

     if (visible) {
-      // Tray may have been initialized being hidden.
+      tray->SetVisible(visible);
       tray->GetWidget()->Show();
     } else {
       tray->GetWidget()->Hide();
     }
   } else {
     NOTIMPLEMENTED();
   }
 }
 
 void WebUILoginView::SetUIEnabled(bool enabled) {
@@ skipping 189 matching lines @@
   if (should_emit_login_prompt_visible_) {
     VLOG(1) << "Login WebUI >> login-prompt-visible";
     chromeos::DBusThreadManager::Get()->GetSessionManagerClient()->
         EmitLoginPromptVisible();
   }
 
   webui_visible_ = true;
 }
 
 }  // namespace chromeos