libvpx: Pull from upstream

source/libvpx/test/decode_with_drops.sh

 #!/bin/sh
 ##
 ##  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.
 ##
@@ skipping 16 matching lines @@
 # Runs decode_with_drops on $1, $2 is interpreted as codec name and used solely
 # to name the output file. $3 is the drop mode, and is passed directly to
 # decode_with_drops.
 decode_with_drops() {
   local decoder="${LIBVPX_BIN_PATH}/decode_with_drops${VPX_TEST_EXE_SUFFIX}"
   local input_file="$1"
   local codec="$2"
   local output_file="${VPX_TEST_OUTPUT_DIR}/decode_with_drops_${codec}"
   local drop_mode="$3"
 
-  [ -x "${decoder}" ] || return 1
+  if [ ! -x "${decoder}" ]; then
+    elog "${decoder} does not exist or is not executable."
+    return 1
+  fi
 
   eval "${decoder}" "${input_file}" "${output_file}" "${drop_mode}" ${devnull}
 
   [ -e "${output_file}" ] || return 1
 }
 
 # Decodes $VP8_IVF_FILE while dropping frames, twice: once in sequence mode,
 # and once in pattern mode.
 # Note: This test assumes that $VP8_IVF_FILE has exactly 29 frames, and could
 # break if the file is modified.
@@ skipping 18 matching lines @@
 
     # Test pattern mode: Drop 3 of every 4 frames.
     decode_with_drops "${VP9_IVF_FILE}" "vp9" "3/4"
   fi
 }
 
 decode_with_drops_tests="decode_with_drops_vp8
                          decode_with_drops_vp9"
 
 run_tests decode_with_drops_verify_environment "${decode_with_drops_tests}"