John McCutchan d72aace3ef Ensure PlatformView engine life cycle callbacks are invoked (flutter/engine#42491)
- Move some code off of the message handler onto the parent class.
- Call the engine life cycle callbacks on PlatformView regardless of
which mode is used.
- Re-enable and fix test that these callbacks are invoked.

Fixes [#120329](https://github.com/flutter/flutter/issues/120329)

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2023-06-01 14:51:25 -07:00
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