Move libvpx from DEPS to src

third_party/libvpx/source/libvpx/vpx/src/vpx_psnr.c

Index: third_party/libvpx/source/libvpx/vpx/src/vpx_psnr.c
diff --git a/third_party/libvpx/source/libvpx/vpx/src/vpx_psnr.c b/third_party/libvpx/source/libvpx/vpx/src/vpx_psnr.c
new file mode 100644
index 0000000000000000000000000000000000000000..05843acb61f0e9cfec9da01266564da703dd8462
--- /dev/null
+++ b/third_party/libvpx/source/libvpx/vpx/src/vpx_psnr.c
@@ -0,0 +1,24 @@
+/*
+ *  Copyright (c) 2014 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.
+ */
+
+#include <math.h>
+
+#include "vpx/internal/vpx_psnr.h"
+
+#define MAX_PSNR 100.0
+
+double vpx_sse_to_psnr(double samples, double peak, double sse) {
+  if (sse > 0.0) {
+    const double psnr = 10.0 * log10(samples * peak * peak / sse);
+    return psnr > MAX_PSNR ? MAX_PSNR : psnr;
+  } else {
+    return MAX_PSNR;
+  }
+}