Add rudimentary mash shelf functionality.

mash/wm/window_manager_application.h

Index: mash/wm/window_manager_application.h
diff --git a/mash/wm/window_manager_application.h b/mash/wm/window_manager_application.h
index 20593df8b3dc605de000204fa991d1b905b52b81..f2878f5bc1b46e2ac1cd446f9decfcffc09efe1c 100644
--- a/mash/wm/window_manager_application.h
+++ b/mash/wm/window_manager_application.h
@@ -16,6 +16,7 @@
 #include "components/mus/public/cpp/window_observer.h"
 #include "components/mus/public/cpp/window_tree_delegate.h"
 #include "components/mus/public/interfaces/accelerator_registrar.mojom.h"
+#include "components/mus/public/interfaces/user_window_controller.mojom.h"
 #include "components/mus/public/interfaces/window_manager.mojom.h"
 #include "components/mus/public/interfaces/window_tree_host.mojom.h"
 #include "mash/wm/public/interfaces/container.mojom.h"
@@ -50,6 +51,7 @@ class WindowManagerApplication
       public mus::mojom::WindowTreeHostClient,
       public mus::WindowTreeDelegate,
       public mojo::InterfaceFactory<mus::mojom::WindowManager>,
+      public mojo::InterfaceFactory<mus::mojom::UserWindowController>,
       public mojo::InterfaceFactory<mus::mojom::AcceleratorRegistrar> {
  public:
   WindowManagerApplication();
@@ -96,6 +98,12 @@ class WindowManagerApplication
       mojo::ApplicationConnection* connection,
       mojo::InterfaceRequest<mus::mojom::WindowManager> request) override;
 
+  // InterfaceFactory<mus::mojom::UserWindowController>:
+  void Create(
+      mojo::ApplicationConnection* connection,
+      mojo::InterfaceRequest<mus::mojom::UserWindowController> request)
+      override;
+
   // mus::WindowObserver:
   void OnWindowDestroyed(mus::Window* window) override;
 
@@ -121,6 +129,11 @@ class WindowManagerApplication
   scoped_ptr<WindowManagerImpl> window_manager_;
   mojo::WeakBindingSet<mus::mojom::WindowManager> window_manager_binding_;
   ScopedVector<mojo::InterfaceRequest<mus::mojom::WindowManager>> requests_;
+  mojo::WeakBindingSet<mus::mojom::UserWindowController>
+      user_window_controller_binding_;
+  ScopedVector<mojo::InterfaceRequest<mus::mojom::UserWindowController>>
+      user_window_controller_requests_;
+
 
   scoped_ptr<BackgroundLayout> background_layout_;
   scoped_ptr<ShelfLayout> shelf_layout_;