GitLab

OnRootScrollOffsetChanged should only be sent if all root scroll
offsets have been requested and only on android.

BUG=1100552
TEST=none

Change-Id: Ibc53cf127df0107e5ac69f9378601c9d25d357e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2283056Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#785790}