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It allows us to evaluate how much memory is unaccounted by heap
profiler.

Bug: 1007491
Change-Id: Iafd70ddfb65e62a5c038a8b244654ef66c3a795f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1829739Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Alexei Filippov <alph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701407}