Don't apply overflow clips in paint invalidation.

Don't apply overflow clips in paint invalidation.

Previously, such clips were applied if the paint invalidation container did
not scroll overflow, but this is problematic, because overflow:hidden elements
can be scrolled via script.

BUG=597902, 640565
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

Review-Url: https://codereview.chromium.org/2280243002
Cr-Commit-Position: refs/heads/master@{#414951}
(cherry picked from commit 537724421c0f5d046e56fb0eba001da3bcea0613)

Committed: https://chromium.googlesource.com/chromium/src/+/19e275edf518255cc77cf7fe97d501f536ec87b7

[chrishtr, 2016-08-29 21:38:20]

Description was changed from

==========
Don't apply overflow clips in paint invalidation.

Previously, such clips were applied if the paint invalidation container did
not scroll overflow, but this is problematic, because overflow:hidden elements
can be scrolled via script.

BUG=597902,640565
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

Review-Url: https://codereview.chromium.org/2280243002
Cr-Commit-Position: refs/heads/master@{#414951}
(cherry picked from commit 537724421c0f5d046e56fb0eba001da3bcea0613)
==========

to

==========
Don't apply overflow clips in paint invalidation.

Previously, such clips were applied if the paint invalidation container did
not scroll overflow, but this is problematic, because overflow:hidden elements
can be scrolled via script.

BUG=597902,640565
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

Review-Url: https://codereview.chromium.org/2280243002
Cr-Commit-Position: refs/heads/master@{#414951}
(cherry picked from commit 537724421c0f5d046e56fb0eba001da3bcea0613)

Committed:
https://chromium.googlesource.com/chromium/src/+/19e275edf518255cc77cf7fe97d5...
==========

[chrishtr, 2016-08-29 21:38:21]

Committed patchset #1 (id:1) manually as
19e275edf518255cc77cf7fe97d501f536ec87b7.