Move some DocumentTabModel files upstream

Move some DocumentTabModel files upstream

* Moves the DocumentTabModel interface upstream.

* Moves the DocumentTabModelInfo protobuf that stores basic
  info about a DocumentTabModel upstream.  Formerly called
  DocumentDatabase.

* Temporarily adds findbugs warnings until the DocumentTabModelImpl moves upstream.

BUG=415747
NOTRY=true

Committed: https://crrev.com/0dd63b3debbea98295f3b5aa29499257adc7a9bf
Cr-Commit-Position: refs/heads/master@{#307952}

[gone, 2014-12-10 23:49:03]

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

[gone, 2014-12-10 23:49:35]

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

[gone, 2014-12-10 23:49:35]

+Maria for file move
+Chris for GN check

[cjhopman, 2014-12-10 23:51:07]

gn lgtm

[Maria, 2014-12-10 23:57:46]

lgtm

[gone, 2014-12-11 00:03:56]

The CQ bit was checked by dfalcantara@chromium.org

[commit-bot: I haz the power, 2014-12-11 00:05:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/796633002/1

[gone, 2014-12-11 00:32:39]

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

[Ted C, 2014-12-11 00:32:58]

On 2014/12/11 00:32:40, dfalcantara wrote:

owners - lgtm

[gone, 2014-12-11 00:33:32]

The CQ bit was unchecked by dfalcantara@chromium.org

[gone, 2014-12-11 00:33:34]

The CQ bit was checked by dfalcantara@chromium.org

[commit-bot: I haz the power, 2014-12-11 00:35:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/796633002/1

[commit-bot: I haz the power, 2014-12-11 01:36:27]

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

[commit-bot: I haz the power, 2014-12-11 01:36:28]

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

[gone, 2014-12-11 18:34:56]

The CQ bit was checked by dfalcantara@chromium.org

[commit-bot: I haz the power, 2014-12-11 18:35:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/796633002/20001

[commit-bot: I haz the power, 2014-12-11 18:49:24]

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

[commit-bot: I haz the power, 2014-12-11 18:49:25]

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

[gone, 2014-12-11 19:41:02]

Submitting NOTRY=true to get around temporary findbugs additions.

[gone, 2014-12-11 19:41:07]

The CQ bit was checked by dfalcantara@chromium.org

[commit-bot: I haz the power, 2014-12-11 19:42:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/796633002/20001

[commit-bot: I haz the power, 2014-12-11 19:43:35]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2014-12-11 19:44:26]

Patchset 2 (id:??) landed as
https://crrev.com/0dd63b3debbea98295f3b5aa29499257adc7a9bf
Cr-Commit-Position: refs/heads/master@{#307952}