[Chromoting] GetHostAttributes with tests

remoting/host/BUILD.gn

Index: remoting/host/BUILD.gn
diff --git a/remoting/host/BUILD.gn b/remoting/host/BUILD.gn
index d73c11c53ad867ca7fef8165560ed75be943122e..6785cdcce1dd6ca297c846a11e7dfa9870868b81 100644
--- a/remoting/host/BUILD.gn
+++ b/remoting/host/BUILD.gn
@@ -132,6 +132,8 @@ static_library("host") {
     "desktop_session_proxy.h",
     "desktop_session_win.cc",
     "desktop_session_win.h",
+    "directx_traits.cc",
+    "directx_traits.h",
     "disconnect_window_chromeos.cc",
     "disconnect_window_linux.cc",
     "disconnect_window_mac.h",
@@ -170,6 +172,8 @@ static_library("host") {
     "host_status_logger.h",
     "host_status_monitor.h",
     "host_status_observer.h",
+    "host_traits.cc",
+    "host_traits.h",
     "host_window.h",
     "host_window_proxy.cc",
     "host_window_proxy.h",
@@ -501,6 +505,7 @@ source_set("unit_tests") {
     "host_extension_session_manager_unittest.cc",
     "host_power_save_blocker_unittest.cc",
     "host_status_logger_unittest.cc",
+    "host_traits_unittest.cc",
     "ipc_desktop_environment_unittest.cc",
     "it2me/it2me_confirmation_dialog_proxy_unittest.cc",
     "it2me/it2me_host_unittest.cc",