Add the Play Store app search to the launcher.

components/arc/test/fake_app_instance.h

Index: components/arc/test/fake_app_instance.h
diff --git a/components/arc/test/fake_app_instance.h b/components/arc/test/fake_app_instance.h
index 52e287ab11708aa6d03b9e414b073002855a5b51..c3c5d2cc75b6e661b7c95ca68a20f832a9c284bd 100644
--- a/components/arc/test/fake_app_instance.h
+++ b/components/arc/test/fake_app_instance.h
@@ -112,6 +112,10 @@ class FakeAppInstance : public mojom::AppInstance {
   void SetNotificationsEnabled(const std::string& package_name,
                                bool enabled) override;
   void InstallPackage(mojom::ArcPackageInfoPtr arcPackageInfo) override;
+  void GetRecentAndSuggestedAppsFromPlayStore(
+      const std::string& query,
+      int32_t max_results,
+      const GetRecentAndSuggestedAppsFromPlayStoreCallback& callback) override;
 
   // Methods to reply messages.
   void SendRefreshAppList(const std::vector<mojom::AppInfo>& apps);