Add PolymerElements/paper-icon-button and run reproduce.sh

Add PolymerElements/paper-icon-button and run reproduce.sh

This brings paper-icon-button v0.8.0 into third_party/polymer/v0_8.

BUG=485381
Committed: https://crrev.com/2ef682a3fbfc58b94833ce3ff86080f4139d4a97
Cr-Commit-Position: refs/heads/master@{#329474}

[michaelpg, 2015-05-12 18:09:54]

michaelpg@chromium.org changed reviewers:
+ jlklein@chromium.org

[Jeremy Klein, 2015-05-12 18:20:00]

lgtm

[michaelpg, 2015-05-12 20:16:43]

The CQ bit was checked by michaelpg@chromium.org

[michaelpg, 2015-05-12 20:16:43]

The patchset sent to the CQ was uploaded after l-g-t-m from jlklein@chromium.org
Link to the patchset: https://codereview.chromium.org/1136293002/#ps20001
(title: "rebase")

[commit-bot: I haz the power, 2015-05-12 20:18:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1136293002/20001

[commit-bot: I haz the power, 2015-05-12 20:29:39]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-05-12 20:30:43]

Patchset 2 (id:??) landed as
https://crrev.com/2ef682a3fbfc58b94833ce3ff86080f4139d4a97
Cr-Commit-Position: refs/heads/master@{#329474}