tree f024c19026cc23ccf617afc213b95f8062062bc0
parent 18cda1ab960d4638738da618186b48a7598b4de0
author vollick <vollick@chromium.org> 1456952383 -0800
committer Commit bot <commit-bot@chromium.org> 1456952455 +0000

Introduce LayerListIterator

This iterator (unlike the other iterators which are intended to operate
on the RSLL) will traverse a collection of LayerImpls. It is intended
to be used whenever we currently do a walk over the LayerImpl tree.

It currently operates on a tree of layers, but if we migrate all code
to work in terms of this iterator, when we change the underlying
iterator implementation to work on lists, all code will be updated in
unison.

BUG=557194
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1758823003

Cr-Commit-Position: refs/heads/master@{#378827}