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Includes incremental garbage collection infrastructure in regular
builds. Does not enable incremental marking at runtime!

This CL may cause throughput regressions and is an attempt
to collect a broad range of potential performance issues.

Bug: chromium:757440
Change-Id: If4d91be2eb325417736a38e27c481ab23ce7a0e9
Reviewed-on: https://chromium-review.googlesource.com/1041986Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555698}