Sample some instance. They all failed this way:

permission issue on executing /usr/local/autotest/deps/chrome_test/test_src/out/Release/video_decode_accelerator_unittest

* Command: 
    su chronos -c 'HOME=/tmp/tmphepXd_
    CR_SOURCE_ROOT=/usr/local/autotest/deps/chrome_test/test_src
    CHROME_DEVEL_SANDBOX=/opt/google/chrome/chrome-sandbox
    GTEST_OUTPUT=xml:/tmp/gtest_xmle2dxvb.xml /usr/local/autotest/deps/chrome_
    test/test_src/out/Release/video_decode_accelerator_unittest --test_video_d
    ata="/usr/local/autotest/deps/chrome_test/test_src/media/test/data/test-
    25fps.vp8:320:240:250:250:35:150:11" --thumbnail_output_dir="/usr/local/au
    totest/results/default/video_VideoDecodeAccelerator/results" --vmodule=*/m
    edia/gpu/*video_decode_accelerator.cc=2,*/media/gpu/*video_encode_accelera
    tor.cc=2,*/media/gpu/*jpeg_decode_accelerator.cc=2,*/media/gpu/v4l2_image_
    processor.cc=2 --ozone-platform=gbm'
Exit status: 126

Check recent fail on http://sponge/target?tab=Output+Files&sortBy=STATUS&show=ALL&id=90b9b7e8-4d06-4945-a61a-294c1aa02af4&target=daisy-release/R69-10857.0.0/bvt-perbuild/video_VideoDecodeAccelerator.h264

It failed with the exception: 
TestFail: Cannot execute command /usr/local/autotest/deps/chrome_test/test_src/out/Release/video_decode_accelerator_unittest. Permissions: /usr/local/autotest/deps/chrome_test/test_src/out/Release/video_decode_accelerator_unittest 0100755; /usr/local/autotest/deps/chrome_test/test_src/out/Release 040755; /usr/local/autotest/deps/chrome_test/test_src/out 040755; /usr/local/autotest/deps/chrome_test/test_src 040755; /usr/local/autotest/deps/chrome_test 040755; /usr/local/autotest/deps 040755; /usr/local/autotest 040755; /usr/local 040700; /usr 040755; / 040755

This could be related to 740422.