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[canvaskit] cache and reuse platform view overlays #23061
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Description
Cache and reuse overlays created for previous platform views. This made the overlays more susceptible to the "WebGL: CONTEXT_LOST_WEBGL: loseContext: context lost" problem, so this change also includes recovery code for lost GL context.
Related Issues
Fixes flutter/flutter#50721 (again, #22966 didn't fix all situations)
Tests
New tests in
surface_test.dartandembedded_views_test.dart.