arc: Add package app list updated event.

components/arc/test/fake_app_instance.cc

Index: components/arc/test/fake_app_instance.cc
diff --git a/components/arc/test/fake_app_instance.cc b/components/arc/test/fake_app_instance.cc
index c9c06c64c59265b6d50f7997cdefbc872d552958..f60427bf8356c115a9c5d00a24cd057036564451 100644
--- a/components/arc/test/fake_app_instance.cc
+++ b/components/arc/test/fake_app_instance.cc
@@ -63,6 +63,14 @@ void FakeAppInstance::SendRefreshAppList(
   app_host_->OnAppListRefreshed(mojo::Array<mojom::AppInfoPtr>::From(apps));
 }
 
+void FakeAppInstance::SendPackageAppListRefreshed(
+    const mojo::String& package_name,
+    const std::vector<mojom::AppInfo>& apps) {
+  app_host_->OnPackageAppListRefreshed(
+      package_name,
+      mojo::Array<mojom::AppInfoPtr>::From(apps));
+}
+
 void FakeAppInstance::SendInstallShortcuts(
     const std::vector<mojom::ShortcutInfo>& shortcuts) {
   for (auto& shortcut : shortcuts) {