Add a11y virtual keyboard icon when a11y VK is enabled

ash/system/status_area_widget.cc

Index: ash/system/status_area_widget.cc
diff --git a/ash/system/status_area_widget.cc b/ash/system/status_area_widget.cc
index 305dab80eaba79c9a10d1c68000cc1576891d3d7..093b16a4d24327bf05f2638090a1e6d41ce2a1b5 100644
--- a/ash/system/status_area_widget.cc
+++ b/ash/system/status_area_widget.cc
@@ -15,6 +15,7 @@
 #include "ash/system/status_area_widget_delegate.h"
 #include "ash/system/tray/system_tray.h"
 #include "ash/system/tray/system_tray_delegate.h"
+#include "ash/system/virtual_keyboard/virtual_keyboard_tray.h"
 #include "ash/system/web_notification/web_notification_tray.h"
 #include "ash/wm/window_properties.h"
 #include "base/i18n/time_formatting.h"
@@ -32,6 +33,7 @@ StatusAreaWidget::StatusAreaWidget(aura::Window* status_container)
       system_tray_(NULL),
       web_notification_tray_(NULL),
       logout_button_tray_(NULL),
+      virtual_keyboard_tray_(NULL),
       login_status_(user::LOGGED_IN_NONE) {
   views::Widget::InitParams params(
       views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
@@ -51,6 +53,7 @@ void StatusAreaWidget::CreateTrayViews() {
   AddSystemTray();
   AddWebNotificationTray();
   AddLogoutButtonTray();
+  AddVirtualKeyboardTray();
   SystemTrayDelegate* delegate =
       ash::Shell::GetInstance()->system_tray_delegate();
   DCHECK(delegate);
@@ -61,6 +64,8 @@ void StatusAreaWidget::CreateTrayViews() {
     web_notification_tray_->Initialize();
   if (logout_button_tray_)
     logout_button_tray_->Initialize();
+  if (virtual_keyboard_tray_)
+    virtual_keyboard_tray_->Initialize();
   UpdateAfterLoginStatusChange(delegate->GetUserLoginStatus());
 }
 
@@ -119,6 +124,11 @@ void StatusAreaWidget::AddLogoutButtonTray() {
   status_area_widget_delegate_->AddTray(logout_button_tray_);
 }
 
+void StatusAreaWidget::AddVirtualKeyboardTray() {
+  virtual_keyboard_tray_ = new VirtualKeyboardTray(this);
+  status_area_widget_delegate_->AddTray(virtual_keyboard_tray_);
+}
+
 void StatusAreaWidget::SetShelfAlignment(ShelfAlignment alignment) {
   status_area_widget_delegate_->set_alignment(alignment);
   if (system_tray_)
@@ -127,6 +137,8 @@ void StatusAreaWidget::SetShelfAlignment(ShelfAlignment alignment) {
     web_notification_tray_->SetShelfAlignment(alignment);
   if (logout_button_tray_)
     logout_button_tray_->SetShelfAlignment(alignment);
+  if (virtual_keyboard_tray_)
+    virtual_keyboard_tray_->SetShelfAlignment(alignment);
   status_area_widget_delegate_->UpdateLayout();
 }