Chinmay Garde 0a9ea0d319 Make output of run_tests.py easier to understand. (flutter/engine#16229)
* The outputs of all commands are not printed and not just commands that fail.
* The stdout and stderr are now printed in order.
* Clear dividers mark logs from specific subprocesses or errors.
* The test whose run failed should now be exactly on top of the error message and code.
2020-01-29 20:47:35 -08:00
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