[heap] Add UMA histograms for background GC work.
This adds the following histograms: - V8.GCBackgroundMarking - V8.GCBackgroundScavenger - V8.GCBackgroundSweeping Bug: chromium:792552 Change-Id: Iae6fa3258f4fe0d4ed5e415c541a6d29101893a9 Reviewed-on: https://chromium-review.googlesource.com/819530Reviewed-by: Michael Lippautz <mlippautz@chromium.org> Commit-Queue: Ulan Degenbaev <ulan@chromium.org> Cr-Commit-Position: refs/heads/master@{#50005}
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