Add a mojom/StructTrait for display::Display.

ui/display/mojo/display.typemap

Index: ui/display/mojo/display.typemap
diff --git a/ui/display/mojo/display.typemap b/ui/display/mojo/display.typemap
new file mode 100644
index 0000000000000000000000000000000000000000..69a12e792730ed2f9896d1e2b38f20003c03b738
--- /dev/null
+++ b/ui/display/mojo/display.typemap
@@ -0,0 +1,22 @@
+# Copyright 2016 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 = "//ui/display/mojo/display.mojom"
+public_headers = [ "//ui/display/display.h" ]
+traits_headers = [ "//ui/display/mojo/display_struct_traits.h" ]
+sources = [
+  "//ui/display/mojo/display_struct_traits.cc",
+]
+public_deps = [
+  "//ui/display",
+]
+deps = [
+  "//ui/gfx/geometry",
+]
+
+type_mappings = [
+  "display.mojom.Display=display::Display",
+  "display.mojom.DisplayRotation=display::Display::Rotation",
+  "display.mojom.TouchSupport=display::Display::TouchSupport",
+]