[Merge M58] arc: Handle position conflict in app list items.

[Merge M58] arc: Handle position conflict in app list items.

It is not guaranteed that sync items have unique positions. This may
cause crash in case web store app has conflicting pos with some other
app.

TEST=Unit test added
BUG=692802
NOTRY=true
NOPRESUBMIT=true
TBR=stevenjb@chromium.org

Review-Url: https://codereview.chromium.org/2732633003
Cr-Commit-Position: refs/heads/master@{#455195}
(cherry picked from commit 11f9ee62d5cb9fbc3d3f1458e145b06be67f78ae)

Review-Url: https://codereview.chromium.org/2740603002
Cr-Commit-Position: refs/branch-heads/3029@{#51}
Cr-Branched-From: 939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed: https://chromium.googlesource.com/chromium/src/+/651a2d0a721ad7779451275b595ba3ad30d3a3c5

[khmel, 2017-03-07 20:28:43]

Description was changed from

==========
[Merge M58] arc: Handle position conflict in app list items.

It is not guaranteed that sync items have unique positions. This may
cause crash in case web store app has conflicting pos with some other
app.

TEST=Unit test added
BUG=692802

NOTRY=true
NOPRESUBMIT=true
TBR=stevenjb@chromium.org

Review-Url: https://codereview.chromium.org/2732633003
Cr-Commit-Position: refs/heads/master@{#455195}
(cherry picked from commit 11f9ee62d5cb9fbc3d3f1458e145b06be67f78ae)
==========

to

==========
[Merge M58] arc: Handle position conflict in app list items.

It is not guaranteed that sync items have unique positions. This may
cause crash in case web store app has conflicting pos with some other
app.

TEST=Unit test added
BUG=692802

NOTRY=true
NOPRESUBMIT=true
TBR=stevenjb@chromium.org

Review-Url: https://codereview.chromium.org/2732633003
Cr-Commit-Position: refs/heads/master@{#455195}
(cherry picked from commit 11f9ee62d5cb9fbc3d3f1458e145b06be67f78ae)
==========

[khmel, 2017-03-07 20:28:43]

khmel@chromium.org changed reviewers:
- stevenjb@chromium.org

[khmel, 2017-03-07 20:28:46]

The CQ bit was checked by khmel@chromium.org

[commit-bot: I haz the power, 2017-03-07 20:29:32]

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, 2017-03-07 20:42:33]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1488918526069000, "parent_rev":
"c1080fb57cbca2367d947ce94b4eddba499c98a1", "commit_rev":
"651a2d0a721ad7779451275b595ba3ad30d3a3c5"}

[commit-bot: I haz the power, 2017-03-07 20:43:13]

Description was changed from

==========
[Merge M58] arc: Handle position conflict in app list items.

It is not guaranteed that sync items have unique positions. This may
cause crash in case web store app has conflicting pos with some other
app.

TEST=Unit test added
BUG=692802

NOTRY=true
NOPRESUBMIT=true
TBR=stevenjb@chromium.org

Review-Url: https://codereview.chromium.org/2732633003
Cr-Commit-Position: refs/heads/master@{#455195}
(cherry picked from commit 11f9ee62d5cb9fbc3d3f1458e145b06be67f78ae)
==========

to

==========
[Merge M58] arc: Handle position conflict in app list items.

It is not guaranteed that sync items have unique positions. This may
cause crash in case web store app has conflicting pos with some other
app.

TEST=Unit test added
BUG=692802

NOTRY=true
NOPRESUBMIT=true
TBR=stevenjb@chromium.org

Review-Url: https://codereview.chromium.org/2732633003
Cr-Commit-Position: refs/heads/master@{#455195}
(cherry picked from commit 11f9ee62d5cb9fbc3d3f1458e145b06be67f78ae)

Review-Url: https://codereview.chromium.org/2740603002
Cr-Commit-Position: refs/branch-heads/3029@{#51}
Cr-Branched-From:
939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed:
https://chromium.googlesource.com/chromium/src/+/651a2d0a721ad7779451275b595b...
==========

[commit-bot: I haz the power, 2017-03-07 20:43:14]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/651a2d0a721ad7779451275b595b...