Add rudimentary mash shelf functionality.

mash/wm/window_manager_application.cc

Index: mash/wm/window_manager_application.cc
diff --git a/mash/wm/window_manager_application.cc b/mash/wm/window_manager_application.cc
index 748bc481030b538efb942bc6f6a5ffc0c34199b9..2110dce0a0233a77d6d64b39c371052f4e7f52b3 100644
--- a/mash/wm/window_manager_application.cc
+++ b/mash/wm/window_manager_application.cc
@@ -17,6 +17,7 @@
 #include "mash/wm/background_layout.h"
 #include "mash/wm/shadow_controller.h"
 #include "mash/wm/shelf_layout.h"
+#include "mash/wm/user_window_controller_impl.h"
 #include "mash/wm/window_layout.h"
 #include "mash/wm/window_manager_impl.h"
 #include "mojo/services/tracing/public/cpp/tracing_impl.h"
@@ -81,6 +82,7 @@ void WindowManagerApplication::Initialize(mojo::ApplicationImpl* app) {
   mus::mojom::WindowManagerPtr window_manager;
   requests_.push_back(new mojo::InterfaceRequest<mus::mojom::WindowManager>(
       mojo::GetProxy(&window_manager)));
+  user_window_controller_.reset(new UserWindowControllerImpl());
   mus::mojom::WindowTreeHostClientPtr host_client;
   host_client_binding_.Bind(GetProxy(&host_client));
   mus::CreateSingleWindowTreeHost(app, std::move(host_client), this,
@@ -90,6 +92,7 @@ void WindowManagerApplication::Initialize(mojo::ApplicationImpl* app) {
 
 bool WindowManagerApplication::ConfigureIncomingConnection(
     mojo::ApplicationConnection* connection) {
+  connection->AddService<mash::wm::mojom::UserWindowController>(this);
   connection->AddService<mus::mojom::AcceleratorRegistrar>(this);
   connection->AddService<mus::mojom::WindowManager>(this);
   return true;
@@ -137,6 +140,12 @@ void WindowManagerApplication::OnEmbed(mus::Window* root) {
                                        std::move(*request));
   requests_.clear();
 
+  user_window_controller_->Initialize(this);
+  for (auto request : user_window_controller_requests_)
+    user_window_controller_binding_.AddBinding(user_window_controller_.get(),
+                                               std::move(*request));
+  user_window_controller_requests_.clear();
+
   shadow_controller_.reset(new ShadowController(root->connection()));
 }
 
@@ -149,6 +158,19 @@ void WindowManagerApplication::OnConnectionLost(
 
 void WindowManagerApplication::Create(
     mojo::ApplicationConnection* connection,
+    mojo::InterfaceRequest<mash::wm::mojom::UserWindowController> request) {
+  if (root_) {
+    user_window_controller_binding_.AddBinding(user_window_controller_.get(),
+                                               std::move(request));
+  } else {
+    user_window_controller_requests_.push_back(
+        new mojo::InterfaceRequest<mash::wm::mojom::UserWindowController>(
+            std::move(request)));
+  }
+}
+
+void WindowManagerApplication::Create(
+    mojo::ApplicationConnection* connection,
     mojo::InterfaceRequest<mus::mojom::AcceleratorRegistrar> request) {
   static int accelerator_registrar_count = 0;
   if (accelerator_registrar_count == std::numeric_limits<int>::max()) {