Add ResizeObserver use counter

Bug: 612962, 895543
Change-Id: I794b3010dd4d234f81be025987cda38b134aae4e
Reviewed-on: https://chromium-review.googlesource.com/c/1279355
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Chris Harrelson <chrishtr@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#599491}(cherry picked from commit 230b55644cf60b11bb6ae6c32adac7f9a317d1a9)
Reviewed-on: https://chromium-review.googlesource.com/c/1284068
Reviewed-by: Aleks Totic <atotic@chromium.org>
Cr-Commit-Position: refs/branch-heads/3578@{#57}
Cr-Branched-From: 4226ddf99103e493d7afb23a4c7902ee496108b6-refs/heads/master@{#599034}
3 files changed