Add UMA for available memory when a renderer hangs

Bug: 934317
Change-Id: I495d6dd94ede0d56a3619245d2b3866eb03ac718
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1652430
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Commit-Queue: Steven Holte <holte@chromium.org>
Auto-Submit: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#667826}
2 files changed