stuartmorgan 28e61558ae FLEViewController/Engine API changes (flutter/engine#9750)
Updates the way FLEViewController and FLEEngine interact,
making their APIs much more closely aligned with the iOS versions
of the classes.

As part of the change, removes the need for an explicit launch
call on FLEViewController. Also adds entrypoint support when
running an engine directly, matching iOS.

Breaking change for macOS runners.

Part of https://github.com/flutter/flutter/issues/31735
2019-07-10 19:54:41 -07:00
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