Alexander Aprelev 839fd8348a Guard the service protocol's global handlers list with a reader/writer lock. (flutter/engine#6900)
* Revert "Revert "Guard the service protocol's global handlers list with a reader/writer lock (#6888) #6895" (#6899)"

This reverts commit bcf5e1eae123478564468b77251a2674bd0e773e and applies fix for tests on Windows.

* Reland guard the service protocol's global handlers list with a reader/writer lock.

* Remove blank line
2018-11-18 14:36:15 -08:00
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