Version 4.3.61.2 (cherry-pick)

Merged 00477a5d

Ensure that GC idle notifications either make progress or stop requesting more GCs.

BUG=chromium:470615
LOG=N
R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/1071503002

Cr-Commit-Position: refs/branch-heads/4.3@{#3}
Cr-Branched-From: f5c0a23a-refs/heads/4.3.61@{#1}
Cr-Branched-From: 0a7d4f49-refs/heads/master@{#27508}