Fix EGL_BAD_SURFACE when app is paused

[blasten]

Description

When the app is paused, the native Surface window is destroyed. Then, it's reset back when the app is resumed.

Related Issues

Fixes flutter/flutter#64414

Tests

There isn't a good way to test this at the moment.

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[zanderso]

What are the blockers to having a regression test for this?

[blasten]

@zanderso we would need an emulator with this specific version of Android. I wired up the emulators on LUCI and it’s relatively easy to add a new emulator. Then, the scenario app activity could be launched, paused and resumed.

[b055man]

@christopherfujino @blasten Is this fix actually in 1.20.3? I can't see it mentioned in the notes for 1.20.3, also the diff does not show it..
flutter/flutter@1.20.2...1.20.3
[EDIT] nevermind, I now see it's a part of the engine, and the engine version has been updated..
For future, it'd be good though to reference the engine fixes in the release notes too.