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improve performance of browser ext completion

Administrator requested to merge completion-perf into master

Created by: sqs

  • create less garbage in chromePortListener
  • defer UI updates until the animation frame
  • better throttling of EditorCompletionWidget calls to the providers in response to textarea changes

Partially addresses https://github.com/sourcegraph/sourcegraph/issues/3433.

These signiicantly improve the perf problem to the point where it feels as smooth as native GitHub to me.

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