Add assertions to ensure that only one instance of RemoteTestServer is

Add assertions to ensure that only one instance of RemoteTestServer is
used at a time.

This applies to Android, where RemoteTestServer only supports one test
server at a time.

(Creating others while one is already alive will lead to failures).

BUG=665686
Committed: https://crrev.com/07dcb5fae952fa8e3343ed0db2d95b28edd416b5
Cr-Commit-Position: refs/heads/master@{#432756}

[eroman, 2016-11-17 02:43:46]

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

[eroman, 2016-11-17 02:44:47]

eroman@chromium.org changed reviewers:
+ mattm@chromium.org

[commit-bot: I haz the power, 2016-11-17 02:45:20]

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

[mattm, 2016-11-17 02:48:12]

lgtm

[eroman, 2016-11-17 02:53:29]

The CQ bit was unchecked by eroman@chromium.org

[eroman, 2016-11-17 02:53:32]

The CQ bit was checked by eroman@chromium.org

[commit-bot: I haz the power, 2016-11-17 02:54:13]

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 05:11:28]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-17 05:15:18]

Description was changed from

==========
Add assertions to ensure that only one instance of RemoteTestServer is
used at a time.

This applies to Android, where RemoteTestServer only supports one test
server at a time.

(Creating others while one is already alive will lead to failures).

BUG=665686
==========

to

==========
Add assertions to ensure that only one instance of RemoteTestServer is
used at a time.

This applies to Android, where RemoteTestServer only supports one test
server at a time.

(Creating others while one is already alive will lead to failures).

BUG=665686

Committed: https://crrev.com/07dcb5fae952fa8e3343ed0db2d95b28edd416b5
Cr-Commit-Position: refs/heads/master@{#432756}
==========

[commit-bot: I haz the power, 2016-11-17 05:15:19]

Patchset 1 (id:??) landed as
https://crrev.com/07dcb5fae952fa8e3343ed0db2d95b28edd416b5
Cr-Commit-Position: refs/heads/master@{#432756}