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Reland "Add support for Dart Development Service (DDS) in Flutter Tools (#61276)" (#62147)

This reverts commit adc9dde3ba8563eebb824feb689f95eb947ab745.

- Fixed issue where `FallbackDiscovery` would hold on to a `VmService` when launching on iOS devices, causing DDS to fail to start
- Fixed `flutter drive` case where DDS is already running in another flutter_tools instance
B
Ben Konyi committed
3a5a3eaf68fc47796b54a16217d45f224f74388a
Parent: a4d570f
Committed by GitHub <noreply@github.com> on 7/29/2020, 5:05:40 PM