Add frame-specific InterfaceProviderSpec.

services/service_manager/public/cpp/interface_provider_spec.h

Index: services/service_manager/public/cpp/interface_provider_spec.h
diff --git a/services/service_manager/public/cpp/interface_provider_spec.h b/services/service_manager/public/cpp/interface_provider_spec.h
index 5b8591164075e733f1eef928794e5295c467072e..4d6e45b5cfacf72b5e4a125978378a4d13d68081 100644
--- a/services/service_manager/public/cpp/interface_provider_spec.h
+++ b/services/service_manager/public/cpp/interface_provider_spec.h
@@ -35,6 +35,13 @@ struct InterfaceProviderSpec {
 using InterfaceProviderSpecMap =
     std::unordered_map<std::string, InterfaceProviderSpec>;
 
+// Convenience for reading a spec named |spec_name| out of |map|. If such a spec
+// is found, |spec| is modified and this function returns true. If a spec is not
+// found, |spec| is unmodified and this function returns false.
+bool GetInterfaceProviderSpec(const std::string& spec_name,
+                              const InterfaceProviderSpecMap& map,
+                              InterfaceProviderSpec* spec);
+
 }  // namespace service_manager
 
 #endif  // SERVICES_SERVICE_MANAGER_PUBLIC_CPP_INTERFACE_PROVIDER_SPEC_H_