cros: Pull user info from session_controller_client.mojom into separate mojom.

ash/public/interfaces/user_info.typemap

Index: ash/public/interfaces/user_info.typemap
diff --git a/ash/public/interfaces/user_info.typemap b/ash/public/interfaces/user_info.typemap
new file mode 100644
index 0000000000000000000000000000000000000000..5a0e9376f8e0a608d146c8620d86fa5eec0035d6
--- /dev/null
+++ b/ash/public/interfaces/user_info.typemap
@@ -0,0 +1,11 @@
+# Copyright 2017 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.
+
+mojom = "//ash/public/interfaces/user_info.mojom"
+public_headers = [ "//components/user_manager/user_type.h" ]
+traits_headers = [ "//ash/public/interfaces/user_info_traits.h" ]
+public_deps = [
+  "//components/user_manager",
+]
+type_mappings = [ "ash.mojom.UserType=user_manager::UserType" ]