[Chrome OS MD] Draw a 1px separator between 2 tray items

ash/common/system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc

Index: ash/common/system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc
diff --git a/ash/common/system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc b/ash/common/system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc
index 5e2391ff8370638d3d2e99f623ed125764b3276c..aa4e4a36af58ad1eb14dbd27377f1a8b31762a60 100644
--- a/ash/common/system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc
+++ b/ash/common/system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc
@@ -9,9 +9,12 @@
 #include "ash/common/keyboard/keyboard_ui.h"
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/shelf/shelf_constants.h"
+#include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/shelf/wm_shelf_util.h"
+#include "ash/common/system/chromeos/session/logout_button_tray.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/system/tray/tray_utils.h"
+#include "ash/common/system/view_observer.h"
 #include "ash/common/wm_shell.h"
 #include "grit/ash_resources.h"
 #include "grit/ash_strings.h"
@@ -25,8 +28,9 @@
 
 namespace ash {
 
-VirtualKeyboardTray::VirtualKeyboardTray(WmShelf* wm_shelf)
-    : TrayBackgroundView(wm_shelf), button_(nullptr) {
+VirtualKeyboardTray::VirtualKeyboardTray(WmShelf* wm_shelf,
+                                         ViewObserver* view_observer)
+    : TrayBackgroundView(wm_shelf, view_observer), button_(nullptr) {
   button_ = new views::ImageButton(this);
   if (MaterialDesignController::IsShelfMaterial()) {
     gfx::ImageSkia image_md =
@@ -57,7 +61,6 @@ VirtualKeyboardTray::~VirtualKeyboardTray() {
 
 void VirtualKeyboardTray::SetShelfAlignment(ShelfAlignment alignment) {
   TrayBackgroundView::SetShelfAlignment(alignment);
-  tray_container()->SetBorder(views::Border::NullBorder());
 
   // Pad button size to align with other controls in the system tray.
   const gfx::ImageSkia image =