Move libvpx from DEPS to src

third_party/libvpx/source/libvpx/vp9/encoder/x86/vp9_dct_avx2.c

Index: third_party/libvpx/source/libvpx/vp9/encoder/x86/vp9_dct_avx2.c
diff --git a/third_party/libvpx/source/libvpx/vp9/encoder/x86/vp9_dct_avx2.c b/third_party/libvpx/source/libvpx/vp9/encoder/x86/vp9_dct_avx2.c
new file mode 100644
index 0000000000000000000000000000000000000000..3a19f52746ce1b3fad16d01fd05773a7e20f8173
--- /dev/null
+++ b/third_party/libvpx/source/libvpx/vp9/encoder/x86/vp9_dct_avx2.c
@@ -0,0 +1,26 @@
+/*
+ *  Copyright (c) 2012 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 <immintrin.h>  // AVX2
+#include "vp9/common/vp9_idct.h"  // for cospi constants
+#include "vpx_ports/mem.h"
+
+
+#define FDCT32x32_2D_AVX2 vp9_fdct32x32_rd_avx2
+#define FDCT32x32_HIGH_PRECISION 0
+#include "vp9/encoder/x86/vp9_dct32x32_avx2.c"
+#undef  FDCT32x32_2D_AVX2
+#undef  FDCT32x32_HIGH_PRECISION
+
+#define FDCT32x32_2D_AVX2 vp9_fdct32x32_avx2
+#define FDCT32x32_HIGH_PRECISION 1
+#include "vp9/encoder/x86/vp9_dct32x32_avx2.c" // NOLINT
+#undef  FDCT32x32_2D_AVX2
+#undef  FDCT32x32_HIGH_PRECISION