[Media Router] Parse device description xml in utility process

chrome/common/media_router/BUILD.gn

Index: chrome/common/media_router/BUILD.gn
diff --git a/chrome/common/media_router/BUILD.gn b/chrome/common/media_router/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..8e5f0bafb3f782e6ab8232104b8a36c3dc5f6afb
--- /dev/null
+++ b/chrome/common/media_router/BUILD.gn
@@ -0,0 +1,15 @@
+# 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.
+
+import("//mojo/public/tools/bindings/mojom.gni")
+
+mojom("interfaces") {
+  sources = [
+    "dial_device_description_parser.mojom",
+  ]
+
+  public_deps = [
+    "//mojo/common:common_custom_types",
+  ]
+}