Add install warning for printerProvider permission

Add install warning for printerProvider permission

BUG=None
TEST=Install an extension with printerProvider permission;
install dialog should contain a warning for the permission

Committed: https://crrev.com/4298949c51c3c35e795a221f61a6427fd93d427f
Cr-Commit-Position: refs/heads/master@{#322553}

[tbarzic, 2015-03-26 18:36:06]

tbarzic@chromium.org changed reviewers:
+ isherman@chromium.org, yoz@chromium.org

[tbarzic, 2015-03-26 18:36:08]

Please take a look.

isherman owner for histograms

[Yoyo Zhou, 2015-03-26 19:48:16]

Can you add a unit test for this?

[tbarzic, 2015-03-26 20:09:44]

added a unit test

[Yoyo Zhou, 2015-03-26 20:22:41]

LGTM

[Ilya Sherman, 2015-03-26 20:23:15]

histograms.xml lgtm

[tbarzic, 2015-03-27 04:28:09]

The CQ bit was checked by tbarzic@chromium.org

[tbarzic, 2015-03-27 04:28:11]

The patchset sent to the CQ was uploaded after l-g-t-m from yoz@chromium.org,
isherman@chromium.org
Link to the patchset: https://codereview.chromium.org/1021763003/#ps60001
(title: ".")

[commit-bot: I haz the power, 2015-03-27 04:28:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1021763003/60001

[commit-bot: I haz the power, 2015-03-27 11:17:49]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2015-03-27 11:18:58]

Patchset 4 (id:??) landed as
https://crrev.com/4298949c51c3c35e795a221f61a6427fd93d427f
Cr-Commit-Position: refs/heads/master@{#322553}