diff -r 000000000000 -r 6474c204b198 media/libvpx/vp9/common/vp9_systemdependent.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/media/libvpx/vp9/common/vp9_systemdependent.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,40 @@
+/*
+ *  Copyright (c) 2010 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 VP9_COMMON_VP9_SYSTEMDEPENDENT_H_
+#define VP9_COMMON_VP9_SYSTEMDEPENDENT_H_
+
+#ifdef _MSC_VER
+#include <math.h>
+#define snprintf _snprintf
+#endif
+
+#include "./vpx_config.h"
+#if ARCH_X86 || ARCH_X86_64
+void vpx_reset_mmx_state(void);
+#define vp9_clear_system_state() vpx_reset_mmx_state()
+#else
+#define vp9_clear_system_state()
+#endif
+
+#if defined(_MSC_VER) && _MSC_VER < 1800
+// round is not defined in MSVC before VS2013.
+static int round(double x) {
+  if (x < 0)
+    return (int)ceil(x - 0.5);
+  else
+    return (int)floor(x + 0.5);
+}
+#endif
+
+struct VP9Common;
+void vp9_machine_specific_config(struct VP9Common *cm);
+
+#endif  // VP9_COMMON_VP9_SYSTEMDEPENDENT_H_