ExtensionDelegate to abstract extension implementation

athena/main/athena_launcher.cc

Index: athena/main/athena_launcher.cc
diff --git a/athena/main/athena_launcher.cc b/athena/main/athena_launcher.cc
index 693243584c7202825ba6ad2ffac516a8f27184fe..190e74691c7e6f279d6e364628201223e9c44801 100644
--- a/athena/main/athena_launcher.cc
+++ b/athena/main/athena_launcher.cc
@@ -8,6 +8,7 @@
 #include "athena/activity/public/activity_manager.h"
 #include "athena/content/public/content_activity_factory.h"
 #include "athena/content/public/content_app_model_builder.h"
+#include "athena/extensions/public/extension_delegate.h"
 #include "athena/home/public/home_card.h"
 #include "athena/home/public/home_card.h"
 #include "athena/input/public/input_manager.h"
@@ -125,6 +126,7 @@ void StartAthenaEnv(aura::Window* root_window) {
 }
 
 void StartAthenaSessionWithContext(content::BrowserContext* context) {
+  athena::ExtensionDelegate::InitExtensionDelegateForShell(context);
   StartAthenaSession(new athena::ContentActivityFactory(),
                      new athena::ContentAppModelBuilder(context));
   athena::VirtualKeyboardManager::Create(context);
@@ -154,6 +156,7 @@ void ShutdownAthena() {
   athena::ScreenManager::Shutdown();
   athena::InputManager::Shutdown();
   athena::SystemUI::Shutdown();
+  athena::ExtensionDelegate::Shutdown();
 
   delete views::ViewsDelegate::views_delegate;
 }