Move DocumentTabModelSelector and related classes upstream

Move DocumentTabModelSelector and related classes upstream

* Moves various classes upstream.
* Changes ActivityDelegate to use the DocumentUtils to access
  the task's baseIntent instead of calling getTaskInfo() directly.
* Findbugs file changed for fields that are only read downstream.

Submitting with NOTRY as true to get around findbugs submission issues.

BUG=443773
NOTRY=true

Committed: https://crrev.com/df1702e8aa43e3996d64c0988e48612a5fad4624
Cr-Commit-Position: refs/heads/master@{#309473}

[gone, 2014-12-22 20:07:29]

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

[Yusuf, 2014-12-22 21:36:38]

lgtm

[gone, 2014-12-22 21:56:33]

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

[gone, 2014-12-22 21:57:33]

dfalcantara@chromium.org changed reviewers:
+ cjhopman@chromium.org
- tedchoc@chromium.org

[gone, 2014-12-22 21:57:58]

TBR cjhopman for the findbugs change.

[gone, 2014-12-22 21:58:01]

The CQ bit was checked by dfalcantara@chromium.org

[commit-bot: I haz the power, 2014-12-22 21:58:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/821063002/20001

[cjhopman, 2014-12-22 22:03:38]

lgtm

[commit-bot: I haz the power, 2014-12-22 22:05:11]

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

[commit-bot: I haz the power, 2014-12-22 22:05:12]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[gone, 2014-12-22 22:11:13]

The CQ bit was checked by dfalcantara@chromium.org

[commit-bot: I haz the power, 2014-12-22 22:12:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/821063002/40001

[commit-bot: I haz the power, 2014-12-22 22:20:38]

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

[commit-bot: I haz the power, 2014-12-22 22:20:39]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[gone, 2014-12-22 22:35:11]

The CQ bit was checked by dfalcantara@chromium.org

[commit-bot: I haz the power, 2014-12-22 22:36:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/821063002/40001

[commit-bot: I haz the power, 2014-12-22 22:38:30]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2014-12-22 22:40:15]

Patchset 3 (id:??) landed as
https://crrev.com/df1702e8aa43e3996d64c0988e48612a5fad4624
Cr-Commit-Position: refs/heads/master@{#309473}