cc: Ensure a scroll/scale update during commit triggers a layer update
If we apply a non-zero scroll or page scale update during a commit, we
should also run the layer update stage of the commit process to make
sure the contents of the affected layers are update appropriately.
Previously this would happen automatically since we always updated
layers automatically, but now this needs to be requested explicitly.
TBR=enne@chromium.org
BUG=522195
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
Review URL: https://codereview.chromium.org/
1297353007
Cr-Commit-Position: refs/heads/master@{#344628}