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

ui/ozone/common/mojo/display_mode_proxy_test.mojom

Index: ui/ozone/common/mojo/display_mode_proxy_test.mojom
diff --git a/ui/ozone/common/mojo/display_mode_proxy_test.mojom b/ui/ozone/common/mojo/display_mode_proxy_test.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..cbd2f160bd7a231ad674ef30ba93336b055b1e08
--- /dev/null
+++ b/ui/ozone/common/mojo/display_mode_proxy_test.mojom
@@ -0,0 +1,12 @@
+// 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.
+
+module ui.mojom;
+
+import "ui/ozone/common/mojo/display_mode_proxy.mojom";
+
+interface DisplayModeProxyTest {

[kylechar, 2017/01/17 17:19:27]

You'll want to use the same test interface for DisplaySnapshotParams and maybe
others, so the name should be more general.

+  [Sync]
+  BounceDisplayModeProxy(DisplayModeProxy in) => (DisplayModeProxy out);

[kylechar, 2017/01/17 17:19:27]

This should be EchoDisplayModeParams. It looks like one test uses
"BounceStructName" but many tests uses "EchoStructName", so go with the more
common usage.

+};