Changing SpawnChild to return a struct.

mojo/edk/embedder/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/nacl/config.gni")
 
 source_set("headers") {
   sources = [
     "configuration.h",
     "embedder.h",
@@ skipping 17 matching lines @@
 source_set("embedder") {
   # This isn't really a standalone target; it must be linked into the
   # mojo_system_impl component.
   visibility = [
     "//mojo/edk/system",
     "//components/nacl:nacl",
   ]
 
   sources = [
     "configuration.h",
+    "connection_param.cc",
+    "connection_param.h",
     "embedder.cc",
     "embedder.h",
     "embedder_internal.h",
     "entrypoints.cc",
     "entrypoints.h",
     "pending_process_connection.cc",
     "scoped_ipc_support.cc",
     "scoped_ipc_support.h",
 
     # Test-only code:
@@ skipping 87 matching lines @@
 
   deps = [
     "//base",
     "//base/test:test_support",
     "//mojo/edk/system",
     "//mojo/edk/system:test_utils",
     "//mojo/edk/test:test_support",
     "//testing/gtest",
   ]
 }