Update external/libyuv to r1837

Update external/libyuv to version r1837 (d53f1bee) from upstream.

This brings in some new functions that will be used by libavif.

Also update README.version with local modifications. The files/
subdirectory is a pristine copy of the upstream checkout except
for the local modifications that are listed in README.version.

Bug: b/241008246
Bug: b/228492909
Test: Builds. Media and Camera CTS tests pass.
Merged-In: I1bd041e475666e13fafd8c3792d7142a022d435a
Change-Id: I85df21181e582ff835aab1e9ef13ad3ac8421d30

1 files changed, 51 insertions, 0 deletions

diff --git a/files/include/libyuv/scale_uv.h b/files/include/libyuv/scale_uv.h
new file mode 100644
index 00000000..8e74e319
--- /dev/null
+++ b/files/include/libyuv/scale_uv.h
@@ -0,0 +1,51 @@
+/*
+ *  Copyright 2020 The LibYuv 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 INCLUDE_LIBYUV_SCALE_UV_H_
+#define INCLUDE_LIBYUV_SCALE_UV_H_
+
+#include "libyuv/basic_types.h"
+#include "libyuv/scale.h"  // For FilterMode
+
+#ifdef __cplusplus
+namespace libyuv {
+extern "C" {
+#endif
+
+LIBYUV_API
+int UVScale(const uint8_t* src_uv,
+            int src_stride_uv,
+            int src_width,
+            int src_height,
+            uint8_t* dst_uv,
+            int dst_stride_uv,
+            int dst_width,
+            int dst_height,
+            enum FilterMode filtering);
+
+// Scale a 16 bit UV image.
+// This function is currently incomplete, it can't handle all cases.
+LIBYUV_API
+int UVScale_16(const uint16_t* src_uv,
+               int src_stride_uv,
+               int src_width,
+               int src_height,
+               uint16_t* dst_uv,
+               int dst_stride_uv,
+               int dst_width,
+               int dst_height,
+               enum FilterMode filtering);
+
+#ifdef __cplusplus
+}  // extern "C"
+}  // namespace libyuv
+#endif
+
+#endif  // INCLUDE_LIBYUV_SCALE_UV_H_