Print Preview UI tweaks

Print Preview UI changes:
- show 'More options' section only if there are more than 6 sections
  avaialble
- add ARIA labels for the color, copies, margins, layout and paper
  settings
- group Paper size section with other collapsible sections
- adjust Advanced options button size to fit the text

BUG=397741
Committed: https://crrev.com/4db543f3ebedb955c32b8a64a0993766079ddbde
Cr-Commit-Position: refs/heads/master@{#294287}

[Aleksey Shlyapnikov, 2014-09-10 18:45:30]

alekseys@chromium.org changed reviewers:
+ vitalybuka@chromium.org

[Vitaly Buka (NO REVIEWS), 2014-09-10 20:06:17]

The CQ bit was checked by vitalybuka@chromium.org

[Vitaly Buka (NO REVIEWS), 2014-09-10 20:06:17]

lgtm

[commit-bot: I haz the power, 2014-09-10 20:17:59]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/alekseys@chromium.org/556363003/1

[commit-bot: I haz the power, 2014-09-10 21:51:52]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-09-10 21:51:53]

Try jobs failed on following builders:
  linux_chromium_chromeos_rel_swarming on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  linux_chromium_rel_swarming on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Aleksey Shlyapnikov, 2014-09-10 23:46:36]

The CQ bit was checked by alekseys@chromium.org

[commit-bot: I haz the power, 2014-09-10 23:49:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/556363003/20001

[commit-bot: I haz the power, 2014-09-11 01:41:54]

Committed patchset #2 (id:20001) as 06aadc6bd3a7d44bd288f85c70c021c1356dcebf

[commit-bot: I haz the power, 2014-09-11 02:00:11]

Patchset 2 (id:??) landed as
https://crrev.com/4db543f3ebedb955c32b8a64a0993766079ddbde
Cr-Commit-Position: refs/heads/master@{#294287}