Add OpenVR SDK to third_party

third_party/openvr/BUILD.gn

Index: third_party/openvr/BUILD.gn
diff --git a/third_party/openvr/BUILD.gn b/third_party/openvr/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..d31d603d1d99b70264ce0a664d7a8883e44dbd8e
--- /dev/null
+++ b/third_party/openvr/BUILD.gn
@@ -0,0 +1,30 @@
+# 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.
+
+loadable_module("openvr") {
+  output_name = "openvr_api"
+
+  configs -= [ "//build/config/win:unicode" ]

[ddorwin, 2017/03/21 21:05:07]

Explain this and the next item.

[billorr, 2017/03/21 21:36:39]

Done.

+
+  defines = [ "VR_API_PUBLIC" ]
+
+  sources = [
+    "src/src/jsoncpp.cpp",
+    "src/src/openvr_api_public.cpp",
+    "src/src/vrcommon/dirtools_public.cpp",
+    "src/src/vrcommon/envvartools_public.cpp",
+    "src/src/vrcommon/hmderrors_public.cpp",
+    "src/src/vrcommon/pathtools_public.cpp",
+    "src/src/vrcommon/sharedlibtools_public.cpp",
+    "src/src/vrcommon/strtools_public.cpp",
+    "src/src/vrcommon/vrpathregistry_public.cpp",
+  ]
+
+  include_dirs = [
+    "src/headers",
+    "src/src",
+    "src/src/json",
+    "src/src/vrcommon",
+  ]
+}