[Athena] minimum impl to add screen/background and test windows

athena/main/athena_main.cc

Index: athena/main/athena_main.cc
diff --git a/athena/main/athena_main.cc b/athena/main/athena_main.cc
index 3a334d72b74ab5cbcdf34cf7c56b055fd025895e..8e8cc63a7b8a55ec1a6ee3781f9245e26a25202b 100644
--- a/athena/main/athena_main.cc
+++ b/athena/main/athena_main.cc
@@ -4,7 +4,12 @@
 
 #include "apps/shell/app/shell_main_delegate.h"
 #include "apps/shell/browser/shell_browser_main_delegate.h"
+#include "apps/shell/browser/shell_desktop_controller.h"
+#include "athena/main/placeholder.h"
+#include "athena/screen/public/screen_manager.h"
+#include "athena/wm/public/window_manager.h"
 #include "content/public/app/content_main.h"
+#include "ui/aura/window_tree_host.h"
 
 class AthenaBrowserMainDelegate : public apps::ShellBrowserMainDelegate {
  public:
@@ -12,8 +17,20 @@ class AthenaBrowserMainDelegate : public apps::ShellBrowserMainDelegate {
   virtual ~AthenaBrowserMainDelegate() {}
 
   // apps::ShellBrowserMainDelegate:
-  virtual void Start(content::BrowserContext* context) OVERRIDE {}
-  virtual void Shutdown() OVERRIDE {}
+  virtual void Start(content::BrowserContext* context) OVERRIDE {
+    athena::ScreenManager::Create(apps::ShellDesktopController::instance()
+                                      ->GetWindowTreeHost()
+                                      ->window());
+    athena::WindowManager::Create();
+
+    SetupBackgroundImage();
+    CreateTestWindows();
+  }
+
+  virtual void Shutdown() OVERRIDE {
+    athena::WindowManager::Shutdown();
+    athena::ScreenManager::Shutdown();
+  }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AthenaBrowserMainDelegate);