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carlosk authored
An update to xvfb.py changed its input arguments and the previously required first one pointing to the execution directory has been removed. This change adds makes it backwards-aware: if the first argument, now expected to be the command, points to a directory it exists gracefully with a helpful error message. BUG= Review-Url: https://codereview.chromium.org/2748123004 Cr-Commit-Position: refs/heads/master@{#456957}
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