Alexander Aprelev 3b7942c444
Fix multi-step build handling process. (#24310)
* Fix multi-step build handling process.

Stop listening for new step updates after 'all done.' log message. Make sure that we don't delete file too soon, until listener had a chance to process the 'all done' message.

Fixes https://github.com/flutter/flutter/issues/18750

* Emit 'all output' explicitly when build process is done.
2018-11-14 08:54:13 -08:00
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