ash: Add SessionController/Client mojo interfaces

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 f8bab26711a577dd45cc822ecdf41ca7919cfeaf..2e9becd3c65eaceb95ecf25a5bd87ffcfd1b7b21 100644
--- a/ash/common/mojo_interface_factory.cc
+++ b/ash/common/mojo_interface_factory.cc
@@ -6,6 +6,7 @@
 
 #include <utility>
 
+#include "ash/common/session/session_controller.h"
 #include "ash/common/shelf/shelf_controller.h"
 #include "ash/common/shutdown_controller.h"
 #include "ash/common/system/locale/locale_notification_controller.h"
@@ -29,6 +30,11 @@ void BindLocaleNotificationControllerOnMainThread(
       std::move(request));
 }
 
+void BindSessionControllerRequestOnMainThread(
+    mojom::SessionControllerRequest request) {
+  WmShell::Get()->session_controller()->BindRequest(std::move(request));
+}
+
 void BindShelfRequestOnMainThread(mojom::ShelfControllerRequest request) {
   WmShell::Get()->shelf_controller()->BindRequest(std::move(request));
 }
@@ -63,6 +69,8 @@ void RegisterInterfaces(
   registry->AddInterface(
       base::Bind(&BindLocaleNotificationControllerOnMainThread),
       main_thread_task_runner);
+  registry->AddInterface(base::Bind(&BindSessionControllerRequestOnMainThread),
+                         main_thread_task_runner);
   registry->AddInterface(base::Bind(&BindShelfRequestOnMainThread),
                          main_thread_task_runner);
   registry->AddInterface(base::Bind(&BindShutdownControllerRequestOnMainThread),