Fix under-invalidation of frame scrollbar on hover

Fix under-invalidation of frame scrollbar on hover

Ensure the layoutView() of the frame is setMayNeedPaintInvalidation()
when the scrollbar needs paint invalidation.

BTW, combine PaintInvalidationCapableScrollableArea::
boxForScrollControlPaintInvalidation() and ScrollbarArea::layoutBox()
which was added recently.

BUG=625757
TEST=paint/invalidation/iframe-scrollbar-hover.html

Committed: https://crrev.com/d88ee7c4ceeb1ade22e8525fdef60115fae7ae3e
Cr-Commit-Position: refs/heads/master@{#404958}

[Xianzhu, 2016-07-11 18:33:41]

wangxianzhu@chromium.org changed reviewers:
+ chrishtr@chromium.org

[chrishtr, 2016-07-11 19:03:00]

lgtm

[chrishtr, 2016-07-11 19:03:26]

https://codereview.chromium.org/2136133002/diff/1/third_party/WebKit/LayoutTe...
File
third_party/WebKit/LayoutTests/paint/invalidation/iframe-scrollbar-hover.html
(right):

https://codereview.chromium.org/2136133002/diff/1/third_party/WebKit/LayoutTe...
third_party/WebKit/LayoutTests/paint/invalidation/iframe-scrollbar-hover.html:5:
eventSender.mouseMoveTo(195, 120);
Is this going to be reliable on all platforms?

[Xianzhu, 2016-07-11 19:09:12]

Still need to wait for https://codereview.chromium.org/2137013003/ before
landing.

https://codereview.chromium.org/2136133002/diff/1/third_party/WebKit/LayoutTe...
File
third_party/WebKit/LayoutTests/paint/invalidation/iframe-scrollbar-hover.html
(right):

https://codereview.chromium.org/2136133002/diff/1/third_party/WebKit/LayoutTe...
third_party/WebKit/LayoutTests/paint/invalidation/iframe-scrollbar-hover.html:5:
eventSender.mouseMoveTo(195, 120);
On 2016/07/11 19:03:26, chrishtr wrote:
> Is this going to be reliable on all platforms?

Yes. The frame is absolutely positioned, and the size of scrollbars are the same
on all platforms in layout tests.

[Xianzhu, 2016-07-11 22:58:57]

The CQ bit was checked by wangxianzhu@chromium.org

[commit-bot: I haz the power, 2016-07-11 22:59:35]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-07-12 02:19:32]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-07-12 02:19:33]

Try jobs failed on following builders:
  linux_chromium_rel_ng on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Xianzhu, 2016-07-12 18:07:05]

The CQ bit was checked by wangxianzhu@chromium.org

[commit-bot: I haz the power, 2016-07-12 18:09:04]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-07-12 19:36:32]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-07-12 19:36:35]

Try jobs failed on following builders:
  linux_chromium_chromeos_rel_ng on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Xianzhu, 2016-07-12 22:02:19]

The CQ bit was checked by wangxianzhu@chromium.org

[commit-bot: I haz the power, 2016-07-12 22:06:58]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-07-13 03:26:28]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-13 03:26:30]

CQ bit was unchecked.

[commit-bot: I haz the power, 2016-07-13 03:28:23]

Description was changed from

==========
Fix under-invalidation of frame scrollbar on hover

Ensure the layoutView() of the frame is setMayNeedPaintInvalidation()
when the scrollbar needs paint invalidation.

BTW, combine PaintInvalidationCapableScrollableArea::
boxForScrollControlPaintInvalidation() and ScrollbarArea::layoutBox()
which was added recently.

BUG=625757
TEST=paint/invalidation/iframe-scrollbar-hover.html
==========

to

==========
Fix under-invalidation of frame scrollbar on hover

Ensure the layoutView() of the frame is setMayNeedPaintInvalidation()
when the scrollbar needs paint invalidation.

BTW, combine PaintInvalidationCapableScrollableArea::
boxForScrollControlPaintInvalidation() and ScrollbarArea::layoutBox()
which was added recently.

BUG=625757
TEST=paint/invalidation/iframe-scrollbar-hover.html

Committed: https://crrev.com/d88ee7c4ceeb1ade22e8525fdef60115fae7ae3e
Cr-Commit-Position: refs/heads/master@{#404958}
==========

[commit-bot: I haz the power, 2016-07-13 03:28:24]

Patchset 1 (id:??) landed as
https://crrev.com/d88ee7c4ceeb1ade22e8525fdef60115fae7ae3e
Cr-Commit-Position: refs/heads/master@{#404958}