Create mojom and StructTraits for ui/display/types/display_mode.cc

ui/display/mojo/display_mode.mojom

Index: ui/display/mojo/display_mode.mojom
diff --git a/ui/display/mojo/display_mode.mojom b/ui/display/mojo/display_mode.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..892521ca79b0227b6dade31f99f88b26cb4e2a45
--- /dev/null
+++ b/ui/display/mojo/display_mode.mojom
@@ -0,0 +1,14 @@
+// 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.
+
+module display.mojom;
+
+import "ui/gfx/geometry/mojo/geometry.mojom";
+
+// Corresponds to display::DisplayMode
+struct DisplayMode {
+  gfx.mojom.Size size;
+  bool is_interlaced;
+  float refresh_rate;
+};