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Otherwise, when computing a clip between an descendant and the root layer, the fragment
clip of the root layer from its local border box properties will be wrong, and clip
out the painted output.

Bug:860682

Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I04653f18441becc4557ceca5a68bf513a9908283
Reviewed-on: https://chromium-review.googlesource.com/1149517Reviewed-by: vmpstr <vmpstr@chromium.org>
Commit-Queue: Chris Harrelson <chrishtr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578551}