diff -r 000000000000 -r 6474c204b198 gfx/angle/src/compiler/InitializeParseContext.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/angle/src/compiler/InitializeParseContext.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,40 @@
+//
+// Copyright (c) 2012 The ANGLE Project 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 "compiler/InitializeParseContext.h"
+
+#include "compiler/osinclude.h"
+
+OS_TLSIndex GlobalParseContextIndex = OS_INVALID_TLS_INDEX;
+
+bool InitializeParseContextIndex()
+{
+    assert(GlobalParseContextIndex == OS_INVALID_TLS_INDEX);
+
+    GlobalParseContextIndex = OS_AllocTLSIndex();
+    return GlobalParseContextIndex != OS_INVALID_TLS_INDEX;
+}
+
+void FreeParseContextIndex()
+{
+    assert(GlobalParseContextIndex != OS_INVALID_TLS_INDEX);
+
+    OS_FreeTLSIndex(GlobalParseContextIndex);
+    GlobalParseContextIndex = OS_INVALID_TLS_INDEX;
+}
+
+void SetGlobalParseContext(TParseContext* context)
+{
+    assert(GlobalParseContextIndex != OS_INVALID_TLS_INDEX);
+    OS_SetTLSValue(GlobalParseContextIndex, context);
+}
+
+TParseContext* GetGlobalParseContext()
+{
+    assert(GlobalParseContextIndex != OS_INVALID_TLS_INDEX);
+    return static_cast<TParseContext*>(OS_GetTLSValue(GlobalParseContextIndex));
+}
+