Display dialog when app install succeeds / fails on Athena

athena/extensions/test/test_extensions_delegate.cc

Index: athena/extensions/test/test_extensions_delegate.cc
diff --git a/athena/extensions/test/test_extensions_delegate.cc b/athena/extensions/test/test_extensions_delegate.cc
index 0d0740abec15e33a3aeed76da66bdb958948a3db..95dd1a0277b5f61f0a2f3eea15526366f9250a55 100644
--- a/athena/extensions/test/test_extensions_delegate.cc
+++ b/athena/extensions/test/test_extensions_delegate.cc
@@ -4,6 +4,7 @@
 
 #include "athena/extensions/public/extensions_delegate.h"
 #include "base/macros.h"
+#include "extensions/browser/install/extension_install_ui.h"
 #include "extensions/common/extension_set.h"
 
 namespace athena {
@@ -26,6 +27,11 @@ class TestExtensionsDelegate : public ExtensionsDelegate {
   virtual bool LaunchApp(const std::string& app_id) override { return true; }
   virtual bool UnloadApp(const std::string& app_id) override { return false; }
 
+  virtual scoped_ptr<extensions::ExtensionInstallUI> CreateExtensionInstallUI()
+      override {
+    return scoped_ptr<extensions::ExtensionInstallUI>();
+  }
+
   extensions::ExtensionSet shell_extensions_;
 
   DISALLOW_COPY_AND_ASSIGN(TestExtensionsDelegate);