mash: Have chrome set itself as a controller interface for changing volume

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 a8579f5732e0adf4cece66fc93760e89c74205dc..65d13115d39228d0a137651d79ccb29179e09fb6 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
@@ -25,6 +25,7 @@
 
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/ui/ash/system_tray_client.h"
+#include "chrome/browser/ui/ash/volume_controller.h"
 #include "chrome/browser/ui/ash/vpn_list_forwarder.h"
 #include "chrome/browser/ui/views/select_file_dialog_extension.h"
 #include "chrome/browser/ui/views/select_file_dialog_extension_factory.h"
@@ -47,6 +48,8 @@ void ChromeBrowserMainExtraPartsAsh::PreProfileInit() {
   // Must be available at login screen, so initialize before profile.
   system_tray_client_ = base::MakeUnique<SystemTrayClient>();
 
+  volume_controller_ = base::MakeUnique<VolumeController>();
+
   vpn_list_forwarder_ = base::MakeUnique<VpnListForwarder>();
 
   // For OS_CHROMEOS, virtual keyboard needs to be initialized before profile
@@ -81,6 +84,7 @@ void ChromeBrowserMainExtraPartsAsh::PostProfileInit() {
 void ChromeBrowserMainExtraPartsAsh::PostMainMessageLoopRun() {
 #if defined(OS_CHROMEOS)
   vpn_list_forwarder_.reset();
+  volume_controller_.reset();
   system_tray_client_.reset();
 #endif
   chrome::CloseAsh();