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Instantiate TracingSamplerProfiler in RendererMain.

Change-Id: I527be13dcff3a58a4e60c8fe8ca21474515b91b0
Reviewed-on: https://chromium-review.googlesource.com/c/1336075Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: oysteine <oysteine@chromium.org>
Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613178}