commit 95cfc911f623ea4e98e29e74350898fadda14af8
author wangxianzhu <wangxianzhu@chromium.org> Wed Jul 13 03:00:23 2016
committer Commit bot <commit-bot@chromium.org> Wed Jul 13 03:01:54 2016
tree 8b8cf5b3b1352090e6d813c50cff48bd31c96469
parent cedaf8d293f3ab120e383f0e5adcb00b4d8710b2

Find cached display items directly during painting

Instead of adding CachedDisplayItems in the new display item list and
replace them with real cached display items during commit, now find and
add the real cached display items during painting directly.

The main purpose is to let PaintChunker work for cached subsequences.

Also has other benefits:
- Avoid another display list during commit;
- Avoid creating CachedDisplayItems.

BUG=596983,510908
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review-Url: https://codereview.chromium.org/2107103002
Cr-Commit-Position: refs/heads/master@{#404938}