Move libvpx from DEPS to src

third_party/libvpx/source/libvpx/vp9/encoder/vp9_writer.c

Index: third_party/libvpx/source/libvpx/vp9/encoder/vp9_writer.c
diff --git a/third_party/libvpx/source/libvpx/vp9/encoder/vp9_writer.c b/third_party/libvpx/source/libvpx/vp9/encoder/vp9_writer.c
new file mode 100644
index 0000000000000000000000000000000000000000..ff461f218a4a6c9c8f5d3776301bbdffef88fca7
--- /dev/null
+++ b/third_party/libvpx/source/libvpx/vp9/encoder/vp9_writer.c
@@ -0,0 +1,34 @@
+/*
+ *  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.
+ */
+
+#include <assert.h>
+#include "vp9/encoder/vp9_writer.h"
+#include "vp9/common/vp9_entropy.h"
+
+void vp9_start_encode(vp9_writer *br, uint8_t *source) {
+  br->lowvalue = 0;
+  br->range    = 255;
+  br->count    = -24;
+  br->buffer   = source;
+  br->pos      = 0;
+  vp9_write_bit(br, 0);
+}
+
+void vp9_stop_encode(vp9_writer *br) {
+  int i;
+
+  for (i = 0; i < 32; i++)
+    vp9_write_bit(br, 0);
+
+  // Ensure there's no ambigous collision with any index marker bytes
+  if ((br->buffer[br->pos - 1] & 0xe0) == 0xc0)
+    br->buffer[br->pos++] = 0;
+}
+