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 e359a741b1a700e5b55404310c33f86b170db1d3..3d46f113e19e3c6376c4842d2fe7b32daec85997 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/cast_config_controller.h"
 #include "ash/common/shelf/shelf_controller.h"
 #include "ash/common/shutdown_controller.h"
@@ -25,6 +26,11 @@ namespace ash {
 
 namespace {
 
+void BindAcceleratorControllerRequestOnMainThread(
+    mojom::AcceleratorControllerRequest request) {
+  WmShell::Get()->accelerator_controller()->BindRequest(std::move(request));
+}
+
 void BindCastConfigOnMainThread(mojom::CastConfigRequest request) {
   WmShell::Get()->cast_config()->BindRequest(std::move(request));
 }
@@ -70,6 +76,9 @@ namespace mojo_interface_factory {
 void RegisterInterfaces(
     service_manager::InterfaceRegistry* registry,
     scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner) {
+  registry->AddInterface(
+      base::Bind(&BindAcceleratorControllerRequestOnMainThread),
+      main_thread_task_runner);
   registry->AddInterface(base::Bind(&BindCastConfigOnMainThread),
                          main_thread_task_runner);
   registry->AddInterface(