GitLab

This was a missing part of putting property trees on the compositor
thread. Because these temporary property trees are being used instead of
the ones on LayerTreeImpl, it makes future calls that touch property
trees through LayerImpls have bogus indices because the trees on the
LayerTreeImpl are not the same as the temporary property trees.

R=ajuma@chromium.org,vollick@chromium.org
BUG=481585

Review URL: https://codereview.chromium.org/1146523005

Cr-Commit-Position: refs/heads/master@{#330621}