Gallery: capture escape key in full screen by adding a permission.

Gallery: capture escape key in full screen by adding a permission.

BUG=497011
TEST=manually tested; Maximize Gallery and press slideshow button. Confirm that it goes to slideshow mode. After it, press escape key and confirm that it goes back to the original mode.

Committed: https://crrev.com/7d1560ccb3dfee3c9f1510b035f67261b0b88d8f
Cr-Commit-Position: refs/heads/master@{#333246}

[yawano, 2015-06-08 06:47:35]

yawano@chromium.org changed reviewers:
+ fukino@chromium.org

[yawano, 2015-06-08 06:47:36]

PTAL. Thank you!

[fukino, 2015-06-08 07:07:24]

LGTM. Thanks!

[yawano, 2015-06-08 07:07:57]

On 2015/06/08 07:07:24, fukino wrote:
> LGTM. Thanks!

Thank you!

[yawano, 2015-06-08 07:08:02]

The CQ bit was checked by yawano@chromium.org

[commit-bot: I haz the power, 2015-06-08 07:08:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1149323006/20001

[commit-bot: I haz the power, 2015-06-08 07:11:45]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-06-08 07:12:38]

Patchset 2 (id:??) landed as
https://crrev.com/7d1560ccb3dfee3c9f1510b035f67261b0b88d8f
Cr-Commit-Position: refs/heads/master@{#333246}

[yawano, 2015-06-10 03:17:45]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/1174733005/ by yawano@chromium.org.

The reason for reverting is: All of Gallery Material Redesign will happen in
M46..