f2803ac017
This change contains a couple of changes that should have been in github.com/flutter/engine/commit/3105db8ee856ffef281d018774d21a6164c81236 but fell through the cracks First one lifts the initialization of the flutter::RunConfiguration so that the asset manager gets set on the persistant cache before the shader warmup happens. I'm not sure how this didnt end up in the first PR I think it got mangled during merge conflict resolution. no test coverage for that code because its in the middle of a 400 line constructor Second one fixes a race condition that the tests dont catch because the tests are single threaded. This change restructures the test that missed this bug so that it would have caught that bug and will catch comparable bugs.
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