libvpx: Pull from upstream

source/libvpx/test/clear_system_state.h

Index: source/libvpx/test/clear_system_state.h
===================================================================
--- source/libvpx/test/clear_system_state.h	(revision 0)
+++ source/libvpx/test/clear_system_state.h	(revision 0)
@@ -0,0 +1,31 @@
+/*
+ *  Copyright (c) 2013 The WebM 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 in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#ifndef TEST_CLEAR_SYSTEM_STATE_H_
+#define TEST_CLEAR_SYSTEM_STATE_H_
+
+#include "vpx_config.h"
+extern "C" {
+#if ARCH_X86 || ARCH_X86_64
+# include "vpx_ports/x86.h"
+#endif
+}
+
+namespace libvpx_test {
+
+// Reset system to a known state. This function should be used for all non-API
+// test cases.
+inline void ClearSystemState() {
+#if ARCH_X86 || ARCH_X86_64
+  vpx_reset_mmx_state();
+#endif
+}
+
+}  // namespace libvpx_test
+#endif  // TEST_CLEAR_SYSTEM_STATE_H_