athena: Add the concept of Activity and related managers.

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 8c6e7aba36b2683b498e6639b33d4acc81cf5c66..3c63ba8032c4b6243e9038d96de4b3924a58ac4f 100644
--- a/athena/main/athena_main.cc
+++ b/athena/main/athena_main.cc
@@ -8,6 +8,7 @@
 #include "athena/home/public/home_card.h"
 #include "athena/main/placeholder.h"
 #include "athena/screen/public/screen_manager.h"
+#include "athena/task/public/task_manager.h"
 #include "athena/wm/public/window_manager.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/public/app/content_main.h"
@@ -30,12 +31,15 @@ class AthenaBrowserMainDelegate : public apps::ShellBrowserMainDelegate {
     athena::ScreenManager::Create(root_window);
     athena::WindowManager::Create();
     athena::HomeCard::Create();
+    athena::TaskManager::Create();
 
     SetupBackgroundImage();
     CreateTestWindows();
+    CreateTestPages(context);
   }
 
   virtual void Shutdown() OVERRIDE {
+    athena::TaskManager::Shutdown();
     athena::HomeCard::Shutdown();
     athena::WindowManager::Shutdown();
     athena::ScreenManager::Shutdown();