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

ash/common/mojo_interface_factory.cc

Index: ash/common/mojo_interface_factory.cc
diff --git a/ash/common/mojo_interface_factory.cc b/ash/common/mojo_interface_factory.cc
index 22c02c4644f2393d08a6bd76dc4c57f5c12df686..a9108636c802c3a13fad9671119059ccdcb73f88 100644
--- a/ash/common/mojo_interface_factory.cc
+++ b/ash/common/mojo_interface_factory.cc
@@ -6,6 +6,7 @@
 
 #include <utility>
 
+#include "ash/common/accelerators/accelerator_controller.h"
 #include "ash/common/shelf/shelf_controller.h"
 #include "ash/common/shutdown_controller.h"
 #include "ash/common/system/locale/locale_notification_controller.h"
@@ -47,6 +48,10 @@ void BindTouchViewRequestOnMainThread(mojom::TouchViewManagerRequest request) {
   WmShell::Get()->maximize_mode_controller()->BindRequest(std::move(request));
 }
 
+void BindVolumeRequestOnMainThread(mojom::VolumeRequest request) {
+  WmShell::Get()->accelerator_controller()->BindRequest(std::move(request));
+}
+
 #if defined(OS_CHROMEOS)
 void BindVpnListRequestOnMainThread(mojom::VpnListRequest request) {
   WmShell::Get()->vpn_list()->BindRequest(std::move(request));
@@ -76,6 +81,8 @@ void RegisterInterfaces(
                          main_thread_task_runner);
   registry->AddInterface(base::Bind(&BindTouchViewRequestOnMainThread),
                          main_thread_task_runner);
+  registry->AddInterface(base::Bind(&BindVolumeRequestOnMainThread),
+                         main_thread_task_runner);
 #if defined(OS_CHROMEOS)
   registry->AddInterface(base::Bind(&BindVpnListRequestOnMainThread),
                          main_thread_task_runner);