Display dialog when app install succeeds / fails on Athena

athena/extensions/chrome/extensions_delegate_impl.cc

Index: athena/extensions/chrome/extensions_delegate_impl.cc
diff --git a/athena/extensions/chrome/extensions_delegate_impl.cc b/athena/extensions/chrome/extensions_delegate_impl.cc
index 0d63e50bd2a167fd634a51f01e0be37b87215b6e..652c2d0313d89e1f3235270f32d94a3e5e635b18 100644
--- a/athena/extensions/chrome/extensions_delegate_impl.cc
+++ b/athena/extensions/chrome/extensions_delegate_impl.cc
@@ -6,6 +6,7 @@
 
 #include "athena/activity/public/activity_factory.h"
 #include "athena/extensions/chrome/athena_chrome_app_window_client.h"
+#include "athena/extensions/chrome/athena_extension_install_ui.h"
 #include "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ -89,6 +90,10 @@ class ChromeExtensionsDelegate : public ExtensionsDelegate {
     return false;
   }
 
+  virtual extensions::ExtensionInstallUI* CreateExtensionInstallUI() override {
+    return new AthenaExtensionInstallUI();
+  }
+
   void LaunchV1App(const AppLaunchParams& params,
                    const extensions::Extension* extension) {
     // TODO(oshima): Just activate if the app is already running.