Add NEW_DOCUMENT to intents for document migration

Add NEW_DOCUMENT to intents for document migration

This is a way for the system to identify the addAppTask calls as
new documents. In some cases we were not migrating some tabs
due to this missing.

BUG=499709
Committed: https://crrev.com/b42ba8f670b152a8b1ce1d04c21a5b14200861b5
Cr-Commit-Position: refs/heads/master@{#335725}

[Yusuf, 2015-06-23 18:12:42]

yusufo@chromium.org changed reviewers:
+ dfalcantara@chromium.org

[gone, 2015-06-23 18:44:41]

lgtm

[Yusuf, 2015-06-23 18:45:17]

The CQ bit was checked by yusufo@chromium.org

[commit-bot: I haz the power, 2015-06-23 18:46:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1203493005/1

[commit-bot: I haz the power, 2015-06-23 19:16:36]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-23 19:17:47]

Patchset 1 (id:??) landed as
https://crrev.com/b42ba8f670b152a8b1ce1d04c21a5b14200861b5
Cr-Commit-Position: refs/heads/master@{#335725}