mash: Reverse the responsibilities of the NewWindowClient.

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 3d46f113e19e3c6376c4842d2fe7b32daec85997..ef0b47f774cee1364c4553741be7a808205622ae 100644
--- a/ash/common/mojo_interface_factory.cc
+++ b/ash/common/mojo_interface_factory.cc
@@ -8,6 +8,7 @@
 
 #include "ash/common/accelerators/accelerator_controller.h"
 #include "ash/common/cast_config_controller.h"
+#include "ash/common/new_window_controller.h"
 #include "ash/common/shelf/shelf_controller.h"
 #include "ash/common/shutdown_controller.h"
 #include "ash/common/system/locale/locale_notification_controller.h"
@@ -41,6 +42,11 @@ void BindLocaleNotificationControllerOnMainThread(
       std::move(request));
 }
 
+void BindNewWindowControllerRequestOnMainThread(
+    mojom::NewWindowControllerRequest request) {
+  WmShell::Get()->new_window_controller()->BindRequest(std::move(request));
+}
+
 void BindShelfRequestOnMainThread(mojom::ShelfControllerRequest request) {
   WmShell::Get()->shelf_controller()->BindRequest(std::move(request));
 }
@@ -84,6 +90,9 @@ void RegisterInterfaces(
   registry->AddInterface(
       base::Bind(&BindLocaleNotificationControllerOnMainThread),
       main_thread_task_runner);
+  registry->AddInterface(
+      base::Bind(&BindNewWindowControllerRequestOnMainThread),
+      main_thread_task_runner);
   registry->AddInterface(base::Bind(&BindShelfRequestOnMainThread),
                          main_thread_task_runner);
   registry->AddInterface(base::Bind(&BindShutdownControllerRequestOnMainThread),