Added resources needed for the pairing UI.

Added resources needed for the pairing UI.

List of added resources:
* PNG illustation (1x and 2x).
* Three styles of Roboto font.
* SVG icon.

optimize-png-files.sh was applied to added PNG files.
Icon was not added to 'chrome_unscaled_resources.grd' because it will be inlined
to HTML.

BUG=375191
Committed: https://crrev.com/a7638541a48ba744b87cd51802ed3b1606afee88
Cr-Commit-Position: refs/heads/master@{#296987}

[dzhioev (left Google), 2014-09-25 19:35:25]

dzhioev@chromium.org changed reviewers:
+ oshima@chromium.org

[dzhioev (left Google), 2014-09-25 19:37:13]

Hello, please review.

[oshima, 2014-09-26 16:34:21]

lgtm

[dzhioev (left Google), 2014-09-26 16:36:35]

The CQ bit was checked by dzhioev@chromium.org

[commit-bot: I haz the power, 2014-09-26 16:37:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/607473004/1

[commit-bot: I haz the power, 2014-09-26 18:36:37]

Committed patchset #1 (id:1) as a3692d9e59d483060a669d8ba515ce16280205da

[commit-bot: I haz the power, 2014-09-26 18:37:44]

Patchset 1 (id:??) landed as
https://crrev.com/a7638541a48ba744b87cd51802ed3b1606afee88
Cr-Commit-Position: refs/heads/master@{#296987}