Ensure display item ids are unique for image areas

Ensure display item ids are unique for image areas

When painting the focus ring for an image map's area, we would use the
same display item id (layout object + phase) for both the image's
outline and the focus ring. This patch creates a separate display item
type for image area focus rings.

BUG=606113
Committed: https://crrev.com/e2ef23f23e20d28e9e611961c27fbaa0d49333a8
Cr-Commit-Position: refs/heads/master@{#389392}

[pdr., 2016-04-23 04:04:25]

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

[pdr., 2016-04-23 04:05:09]

The CQ bit was checked by pdr@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-04-23 04:05:22]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1910233005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1910233005/1

[commit-bot: I haz the power, 2016-04-23 10:06:07]

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

[commit-bot: I haz the power, 2016-04-23 10:06:08]

Dry run: Try jobs failed on following builders:
  win_chromium_rel_ng on tryserver.chromium.win (JOB_TIMED_OUT,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)

[Xianzhu, 2016-04-23 21:24:24]

The CQ bit was checked by wangxianzhu@chromium.org

[Xianzhu, 2016-04-23 21:24:24]

lgtm

Thanks!

[commit-bot: I haz the power, 2016-04-23 21:24:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1910233005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1910233005/1

[commit-bot: I haz the power, 2016-04-23 22:55:01]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-23 22:57:22]

Description was changed from

==========
Ensure display item ids are unique for image areas

When painting the focus ring for an image map's area, we would use the
same display item id (layout object + phase) for both the image's
outline and the focus ring. This patch creates a separate display item
type for image area focus rings.

BUG=606113
==========

to

==========
Ensure display item ids are unique for image areas

When painting the focus ring for an image map's area, we would use the
same display item id (layout object + phase) for both the image's
outline and the focus ring. This patch creates a separate display item
type for image area focus rings.

BUG=606113

Committed: https://crrev.com/e2ef23f23e20d28e9e611961c27fbaa0d49333a8
Cr-Commit-Position: refs/heads/master@{#389392}
==========

[commit-bot: I haz the power, 2016-04-23 22:57:24]

Patchset 1 (id:??) landed as
https://crrev.com/e2ef23f23e20d28e9e611961c27fbaa0d49333a8
Cr-Commit-Position: refs/heads/master@{#389392}