[Chromoting] GetHostAttributes with tests

remoting/host/directx_traits.cc

+// 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.
+
+#include "remoting/host/directx_traits.h"
+
+#if defined(OS_WIN)
+#include "remoting/host/host_traits.h"
+#include "third_party/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.h"
+
+namespace remoting {
+
+void RegisterDirectxTraits() {
+  host_traits().Register("DirectX-Capturer",
+                         &ScreenCapturerWinDirectx::IsSupported);
+  // TODO(zijiehe): Add minimum and maximum DirectX version supported on the
+  // system. Blocked by change https://codereview.chromium.org/2468083002/.
+}
+
+}  // namespace remoting
+#else
+namespace remoting {
+// Do nothing on other platforms.
+void RegisterDirectxTraits() {}
+}  // namespace remoting
+#endif