Support multiple Observer instances for ArcSupportHost.

Support multiple Observer instances for ArcSupportHost.

ArcAuthService will be split into smaller pieces, and split
classes need to communicate with ArcSupportHost.
To support such a situation, this CL introduces base::ObserverList
into ArcSupportHost.

BUG=657687
BUG=b/31079732
TEST=Ran on test device. Ran bots.

Committed: https://crrev.com/685dd76fbc10e816e880286a43c1487ac6dcf60b
Cr-Commit-Position: refs/heads/master@{#432867}

[hidehiko, 2016-11-16 05:04:04]

hidehiko@chromium.org changed reviewers:
+ lhchavez@chromium.org

[hidehiko, 2016-11-16 05:04:04]

PTAL.

[Luis Héctor Chávez, 2016-11-16 05:07:05]

lgtm

[hidehiko, 2016-11-17 14:05:46]

The CQ bit was checked by hidehiko@chromium.org

[hidehiko, 2016-11-17 14:05:47]

The patchset sent to the CQ was uploaded after l-g-t-m from
lhchavez@chromium.org
Link to the patchset: https://codereview.chromium.org/2502243002/#ps20001
(title: "rebase")

[commit-bot: I haz the power, 2016-11-17 14:06:06]

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, 2016-11-17 14:35:45]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-11-17 14:37:56]

Description was changed from

==========
Support multiple Observer instances for ArcSupportHost.

ArcAuthService will be split into smaller pieces, and split
classes need to communicate with ArcSupportHost.
To support such a situation, this CL introduces base::ObserverList
into ArcSupportHost.

BUG=657687
BUG=b/31079732
TEST=Ran on test device. Ran bots.
==========

to

==========
Support multiple Observer instances for ArcSupportHost.

ArcAuthService will be split into smaller pieces, and split
classes need to communicate with ArcSupportHost.
To support such a situation, this CL introduces base::ObserverList
into ArcSupportHost.

BUG=657687
BUG=b/31079732
TEST=Ran on test device. Ran bots.

Committed: https://crrev.com/685dd76fbc10e816e880286a43c1487ac6dcf60b
Cr-Commit-Position: refs/heads/master@{#432867}
==========

[commit-bot: I haz the power, 2016-11-17 14:37:57]

Patchset 2 (id:??) landed as
https://crrev.com/685dd76fbc10e816e880286a43c1487ac6dcf60b
Cr-Commit-Position: refs/heads/master@{#432867}