The following events in v8.gc category are emitted:
- V8.GC_BACKGROUND_ARRAY_BUFFER_FREE
- V8.GC_BACKGROUND_STORE_BUFFER
- V8.GC_BACKGROUND_UNMAPPER
- V8.GC_MC_BACKGROUND_EVACUATE_COPY
- V8.GC_MC_BACKGROUND_EVACUATE_UPDATE_POINTERS
- V8.GC_MC_BACKGROUND_MARKING
- V8.GC_MC_BACKGROUND_SWEEPING
- V8.GC_MINOR_MC_BACKGROUND_EVACUATE_COPY
- V8.GC_MINOR_MC_BACKGROUND_EVACUATE_UPDATE_POINTERS
- V8.GC_MINOR_MC_BACKGROUND_MARKING
- V8.GC_SCAVENGER_BACKGROUND_SCAVENGE_PARALLEL

Bug: chromium:758183
Change-Id: I04368f75ac740cbc832a864609709e5a46f5baef
Reviewed-on: https://chromium-review.googlesource.com/825203
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50107}