Enable NVPR with command buffer

src/ports/SkOSEnvironment.cpp

Index: src/ports/SkOSEnvironment.cpp
diff --git a/src/ports/SkOSEnvironment.cpp b/src/ports/SkOSEnvironment.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..cc7aa18cff7f32ee5a9b0f99bdc186c4a8f0825e
--- /dev/null
+++ b/src/ports/SkOSEnvironment.cpp
@@ -0,0 +1,19 @@
+
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkOSEnvironment.h"
+#include <stdlib.h>
+
+void sk_setenv(const char* key, const char* value) {
+#ifdef SK_BUILD_FOR_WIN32
+    _putenv_s(key, value);
+#else
+    setenv(key, value, 1);
+#endif
+}
+