Add the Play Store app search to the launcher.

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 0b3ecbf3db0c739e9e40e3c10ba004605fd10782..09dff88fd74a4eea97de7c6d270220dc2ccc292e 100644
--- a/components/arc/test/fake_app_instance.cc
+++ b/components/arc/test/fake_app_instance.cc
@@ -267,6 +267,13 @@ void FakeAppInstance::InstallPackage(mojom::ArcPackageInfoPtr arcPackageInfo) {
   app_host_->OnPackageAdded(std::move(arcPackageInfo));
 }
 
+void FakeAppInstance::GetRecentAndSuggestedAppsFromPlayStore(
+    const std::string& query,
+    int32_t max_results,
+    const GetRecentAndSuggestedAppsFromPlayStoreCallback& callback) {
+  callback.Run(std::vector<arc::mojom::AppDiscoveryResultPtr>());
+}
+
 void FakeAppInstance::LaunchIntent(
     const std::string& intent_uri,
     const base::Optional<gfx::Rect>& dimension_on_screen) {