Add SwiftShader source to repo

Oct 6 code drop from Transgaming
Review URL: https://chromereviews.googleplex.com/3846015

src/OpenGL ES 2.0/compiler/ossource_posix.cpp

diff --git a/src/OpenGL ES 2.0/compiler/ossource_posix.cpp b/src/OpenGL ES 2.0/compiler/ossource_posix.cpp
new file mode 100644
index 0000000..1e1e699
--- /dev/null
+++ b/src/OpenGL ES 2.0/compiler/ossource_posix.cpp
@@ -0,0 +1,64 @@
+//
+// 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"
+
+#if !defined(ANGLE_OS_POSIX)
+#error Trying to build a posix specific file in a non-posix build.
+#endif
+
+//
+// Thread Local Storage Operations
+//
+OS_TLSIndex OS_AllocTLSIndex()
+{
+    pthread_key_t pPoolIndex;
+
+    //
+    // Create global pool key.
+    //
+    if ((pthread_key_create(&pPoolIndex, NULL)) != 0) {
+        assert(0 && "OS_AllocTLSIndex(): Unable to allocate Thread Local Storage");
+        return false;
+    }
+    else {
+        return pPoolIndex;
+    }
+}
+
+
+bool OS_SetTLSValue(OS_TLSIndex nIndex, void *lpvValue)
+{
+    if (nIndex == OS_INVALID_TLS_INDEX) {
+        assert(0 && "OS_SetTLSValue(): Invalid TLS Index");
+        return false;
+    }
+
+    if (pthread_setspecific(nIndex, lpvValue) == 0)
+        return true;
+    else
+        return false;
+}
+
+
+bool OS_FreeTLSIndex(OS_TLSIndex nIndex)
+{
+    if (nIndex == OS_INVALID_TLS_INDEX) {
+        assert(0 && "OS_SetTLSValue(): Invalid TLS Index");
+        return false;
+    }
+
+    //
+    // Delete the global pool key.
+    //
+    if (pthread_key_delete(nIndex) == 0)
+        return true;
+    else
+        return false;
+}