Simple ossource implementation using NSPR

diff --git a/gfx/angle/src/compiler/osinclude.h b/gfx/angle/src/compiler/osinclude.h
--- a/gfx/angle/src/compiler/osinclude.h
+++ b/gfx/angle/src/compiler/osinclude.h
@@ -7,8 +7,14 @@
 #ifndef __OSINCLUDE_H
 #define __OSINCLUDE_H
 
+#ifdef ANGLE_USE_NSPR
+
+#include "prthread.h"
+
+#else
+
 //
-// This file contains contains the window's specific datatypes and
+// This file contains contains windows specific datatypes and
 // declares any windows specific functions.
 //
 
@@ -32,12 +38,17 @@
 #include <errno.h>
 #endif  // ANGLE_OS_WIN
 
+#endif  // ANGLE_USE_NSPR
+
 #include "compiler/debug.h"
 
 //
 // Thread Local Storage Operations
 //
-#if defined(ANGLE_OS_WIN)
+#if defined(ANGLE_USE_NSPR)
+typedef PRUintn OS_TLSIndex;
+#define OS_INVALID_TLS_INDEX 0xFFFFFFFF
+#elif defined(ANGLE_OS_WIN)
 typedef DWORD OS_TLSIndex;
 #define OS_INVALID_TLS_INDEX (TLS_OUT_OF_INDEXES)
 #elif defined(ANGLE_OS_POSIX)
@@ -52,7 +63,9 @@ bool OS_FreeTLSIndex(OS_TLSIndex nIndex)
 inline void* OS_GetTLSValue(OS_TLSIndex nIndex)
 {
     assert(nIndex != OS_INVALID_TLS_INDEX);
-#if defined(ANGLE_OS_WIN)
+#if defined(ANGLE_USE_NSPR)
+    return PR_GetThreadPrivate(nIndex);
+#elif defined(ANGLE_OS_WIN)
     return TlsGetValue(nIndex);
 #elif defined(ANGLE_OS_POSIX)
     return pthread_getspecific(nIndex);
diff --git a/gfx/angle/src/compiler/ossource_nspr.cpp b/gfx/angle/src/compiler/ossource_nspr.cpp
new file mode 100644
--- /dev/null
+++ b/gfx/angle/src/compiler/ossource_nspr.cpp
@@ -0,0 +1,44 @@
+//
+// Copyright (c) 2002-2010 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.
+//
+
+//
+// This file contains the posix specific functions
+//
+#include "compiler/osinclude.h"
+
+//
+// Thread Local Storage Operations
+//
+OS_TLSIndex OS_AllocTLSIndex()
+{
+    PRUintn index;
+    PRStatus status = PR_NewThreadPrivateIndex(&index, NULL);
+
+    if (status) {
+        assert(0 && "OS_AllocTLSIndex(): Unable to allocate Thread Local Storage");
+        return OS_INVALID_TLS_INDEX;
+    }
+
+    return index;
+}
+
+
+bool OS_SetTLSValue(OS_TLSIndex nIndex, void *lpvValue)
+{
+    if (nIndex == OS_INVALID_TLS_INDEX) {
+        assert(0 && "OS_SetTLSValue(): Invalid TLS Index");
+        return false;
+    }
+
+    return PR_SetThreadPrivate(nIndex, lpvValue) == 0;
+}
+
+
+bool OS_FreeTLSIndex(OS_TLSIndex nIndex)
+{
+    // Can't delete TLS keys with nspr
+    return true;
+}