Add ash::VPNDelegate and Chrome OS implementation

chrome/browser/ui/ash/system_tray_delegate_chromeos.cc

Index: chrome/browser/ui/ash/system_tray_delegate_chromeos.cc
diff --git a/chrome/browser/ui/ash/system_tray_delegate_chromeos.cc b/chrome/browser/ui/ash/system_tray_delegate_chromeos.cc
index 001bb6dd3fef611c810f37fc17298506e26fd953..c78abd84154ac13385bb602b3b1805204ddd3648 100644
--- a/chrome/browser/ui/ash/system_tray_delegate_chromeos.cc
+++ b/chrome/browser/ui/ash/system_tray_delegate_chromeos.cc
@@ -73,6 +73,7 @@
 #include "chrome/browser/ui/ash/system_tray_delegate_utils.h"
 #include "chrome/browser/ui/ash/user_accounts_delegate_chromeos.h"
 #include "chrome/browser/ui/ash/volume_controller_chromeos.h"
+#include "chrome/browser/ui/ash/vpn_delegate_chromeos.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/browser_list.h"
@@ -204,6 +205,7 @@ SystemTrayDelegateChromeOS::SystemTrayDelegateChromeOS()
           kSystemUse24HourClock,
           base::Bind(&SystemTrayDelegateChromeOS::UpdateClockType,
                      base::Unretained(this)))),
+      vpn_delegate_(new VPNDelegateChromeOS),
       weak_ptr_factory_(this) {
   // Register notifications on construction so that events such as
   // PROFILE_CREATED do not get missed if they happen before Initialize().
@@ -862,6 +864,10 @@ void SystemTrayDelegateChromeOS::ShouldRebootOnShutdown(
   shutdown_policy_handler_->CheckIfRebootOnShutdown(callback);
 }
 
+ash::VPNDelegate* SystemTrayDelegateChromeOS::GetVPNDelegate() const {
+  return vpn_delegate_.get();
+}
+
 void SystemTrayDelegateChromeOS::UserAddedToSession(
     const user_manager::User* active_user) {
 }