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Metrics have been added for the GPU using the GPU Tracer. Currently
we record the average, max, and stddev ms for each category
per frame for the following categories:
  render_compositor: Both CPU/GPU side spent on the render compositor.
  browser_compositor: Both CPU/GPU spent on browser compositor.
  total: Both CPU/GPU and total frame time spent in renderer.
  swap: Time between swaps, total FPS.

R=vmiura@chromium.org
BUG=None

Review URL: https://codereview.chromium.org/854833003

Cr-Commit-Position: refs/heads/master@{#313419}