UMA: Add V8.GCMarkCompactor histogram

V8 CL: http://crrev.com/c/1256764

Bug: 843903
Change-Id: I347a507cb25ae86d911ca3863ae79efb57cf2f1d
Reviewed-on: https://chromium-review.googlesource.com/c/1286147
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600573}
1 file changed