Display dialog when app install succeeds / fails on Athena

athena/extensions/public/extensions_delegate.h

Index: athena/extensions/public/extensions_delegate.h
diff --git a/athena/extensions/public/extensions_delegate.h b/athena/extensions/public/extensions_delegate.h
index 95d88f5cebfd520fb218b3afa97af1eac216e9ef..4545edc8504abb91f379eb9500c03b53fa0808c7 100644
--- a/athena/extensions/public/extensions_delegate.h
+++ b/athena/extensions/public/extensions_delegate.h
@@ -15,6 +15,7 @@ class WebContents;
 }
 
 namespace extensions {
+class ExtensionInstallUI;
 class ExtensionSet;
 }
 
@@ -52,6 +53,8 @@ class ATHENA_EXPORT ExtensionsDelegate {
   // Unload an application. Returns true if the application was
   // successfully unloaded.
   virtual bool UnloadApp(const std::string& app_id) = 0;
+
+  virtual extensions::ExtensionInstallUI* CreateExtensionInstallUI() = 0;
 };
 
 }  // namespace athena