0f3bd3ae842e8b287152140aca8d641aca0c035a
According to the profile for the flow manual test, we're spending the vast majority of our time recording timeline traces. This patch removes the timeline traces, which greatly improves performance. Also, optimize TransformLayer to avoid one matrix memcpy. I filed https://github.com/google/vector_math.dart/issues/166 about an API that would make this even faster.
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