This is a reland of 6488c9e5
Original change's description:
> [heap] ArrayBufferTracker: Only consider committed size
> 
> - Only consider commited size of ABs.
> - Compute freed memory from retained sizes byte length might be a
>   HeapNumber and thus prohibited from accessing (as it may be already
>   collected).
> 
> CQ_INCLUDE_TRYBOTS=master.tryserver.v8:v8_linux64_tsan_rel;master.tryserver.v8:v8_linux64_tsan_concurrent_marking_rel_ng;master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
> 
> Bug: chromium:775896
> Change-Id: Ia0bed66afac5e4d5ed58194950a55156e19cec72
> Reviewed-on: https://chromium-review.googlesource.com/725722
> Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#48699}

Tbr: ulan@chromium.org
Bug: chromium:775896
Change-Id: Ibbec1ffa8fe90d3668f0fe0c1b8b9997b5fd644e
Cq-Include-Trybots: master.tryserver.v8:v8_linux64_tsan_rel;master.tryserver.v8:v8_linux64_tsan_concurrent_marking_rel_ng;master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
Reviewed-on: https://chromium-review.googlesource.com/726579Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48707}