Make CaretBase a DisplayItemClient.

Make CaretBase a DisplayItemClient.

From chrishtr@'s http://crrev.com/2296203002 with test added. Fixes caret
invalidation in textarea where caret is scrolled outside of visible textarea
rect.

BUG=634094
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

Review-Url: https://codereview.chromium.org/2293293003
Cr-Commit-Position: refs/heads/master@{#416191}
(cherry picked from commit 5153d9b53989b32068b7759aa0253a1e5662492a)

Committed: https://chromium.googlesource.com/chromium/src/+/6bedbc4f9a7d362447b2dc30544479aa1484f5e1

[wkorman, 2016-09-06 21:12:09]

Description was changed from

==========
Make CaretBase a DisplayItemClient.

From chrishtr@'s http://crrev.com/2296203002 with test added. Fixes caret
invalidation in textarea where caret is scrolled outside of visible textarea
rect.

BUG=634094
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

Review-Url: https://codereview.chromium.org/2293293003
Cr-Commit-Position: refs/heads/master@{#416191}
(cherry picked from commit 5153d9b53989b32068b7759aa0253a1e5662492a)
==========

to

==========
Make CaretBase a DisplayItemClient.

From chrishtr@'s http://crrev.com/2296203002 with test added. Fixes caret
invalidation in textarea where caret is scrolled outside of visible textarea
rect.

BUG=634094
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

Review-Url: https://codereview.chromium.org/2293293003
Cr-Commit-Position: refs/heads/master@{#416191}
(cherry picked from commit 5153d9b53989b32068b7759aa0253a1e5662492a)

Committed:
https://chromium.googlesource.com/chromium/src/+/6bedbc4f9a7d362447b2dc305444...
==========

[wkorman, 2016-09-06 21:12:10]

Committed patchset #1 (id:1) manually as
6bedbc4f9a7d362447b2dc30544479aa1484f5e1.