Reland 1: Enable overriding interface binders for any services running in current process.

services/service_manager/public/cpp/binder_registry.cc

Index: services/service_manager/public/cpp/binder_registry.cc
diff --git a/services/service_manager/public/cpp/binder_registry.cc b/services/service_manager/public/cpp/binder_registry.cc
index d45591626694b4833eda0bb15edea48c8a051b34..d50de16f8b7fadd62e5030b115fc5efc8ea39603 100644
--- a/services/service_manager/public/cpp/binder_registry.cc
+++ b/services/service_manager/public/cpp/binder_registry.cc
@@ -19,6 +19,14 @@ void BinderRegistry::AddInterface(
                                          callback, task_runner));
 }
 
+void BinderRegistry::AddInterface(
+    const std::string& interface_name,
+    const Binder& binder_callback,
+    const scoped_refptr<base::SingleThreadTaskRunner>& task_runner) {
+  SetInterfaceBinder(interface_name, base::MakeUnique<GenericCallbackBinder>(
+                                         binder_callback, task_runner));
+}
+
 void BinderRegistry::RemoveInterface(const std::string& interface_name) {
   auto it = binders_.find(interface_name);
   if (it != binders_.end())