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Now exclude cases of using null output clip for an effect node
if the out-of-flow descenant's containing block has the same clip
as the current clip. This lets PaintChunksToCcLayers and
PropertyTreeManager go through the more optimized path for
more cases.

Bug: 879173
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I5c9e0006dc678c36b752823293f08355a194578b
Reviewed-on: https://chromium-review.googlesource.com/1246686Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594512}