Extend the geometry APIs.

mojo/services/geometry/cpp/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/module_args/mojo.gni")
 import("$mojo_sdk_root/mojo/public/mojo_sdk.gni")
 
 mojo_sdk_source_set("cpp") {
   restrict_external_deps = false
   public_configs = [ "../../public/build/config:mojo_services" ]
   sources = [
+    "formatting.cc",
+    "formatting.h",
+    "geometry_util.cc",
     "geometry_util.h",
   ]
 
   deps = [
     "../interfaces",
   ]
 }