GitLab

This patch cleans up some more recycled twin information. In particular,
it removes it from the picture layer tiling set. This makes it possible
to remove one of the functions that gets the recycled twin from the
layer.

R=enne, danakj

Review URL: https://codereview.chromium.org/1149843002

Cr-Commit-Position: refs/heads/master@{#330820}