Display dialog when app install succeeds / fails on Athena

athena/extensions/shell/extensions_delegate_impl.cc

Index: athena/extensions/shell/extensions_delegate_impl.cc
diff --git a/athena/extensions/shell/extensions_delegate_impl.cc b/athena/extensions/shell/extensions_delegate_impl.cc
index 56e507954f632b4f1f49a5a95a36fc5642006529..bd797f88a3a3fb3719a6e4c2a8da32ca63fb744a 100644
--- a/athena/extensions/shell/extensions_delegate_impl.cc
+++ b/athena/extensions/shell/extensions_delegate_impl.cc
@@ -6,6 +6,7 @@
 
 #include "athena/extensions/shell/athena_shell_app_window_client.h"
 #include "base/macros.h"
+#include "extensions/browser/install/extension_install_ui.h"
 #include "extensions/common/extension_set.h"
 #include "extensions/shell/browser/shell_extension_system.h"
 
@@ -41,6 +42,11 @@ class ShellExtensionsDelegate : public ExtensionsDelegate {
 
   virtual bool UnloadApp(const std::string& app_id) override { return false; }
 
+  virtual scoped_ptr<extensions::ExtensionInstallUI> CreateExtensionInstallUI()
+      override {
+    return scoped_ptr<extensions::ExtensionInstallUI>();
+  }
+
   content::BrowserContext* context_;
   extensions::ShellExtensionSystem* extension_system_;
   extensions::ExtensionSet shell_extensions_;