commit 9e0bad82923e80164de225930fefe0986c1aa98d
author junov <junov@chromium.org> Fri Mar 24 22:44:39 2017
committer Commit bot <commit-bot@chromium.org> Fri Mar 24 22:44:39 2017
tree 8a33f67700766cf05deef391647a11a07847f071
parent 0c5ada71f25ba9b76a635f4be3cbd08ac0b007ce

Fix the compositing of placeholder canvas backgrounds

In CompositedLayerMapping::updateContentsOpaque(), we were falsely
assuming that an opaque CSS background made the content layer opaque
this was causing rendering artifacts because culling optimizations
were kicking in when they should not.

BUG=703673
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

Review-Url: https://codereview.chromium.org/2774903003
Cr-Commit-Position: refs/heads/master@{#459583}