Add SandboxPrioritizedOriginDatabase support for dump_file_system

Add SandboxPrioritizedOriginDatabase support for dump_file_system

Origin database of FileSystem API performs special handling for Apps V2.
This CL updates dump_file_system to support it.

BUG=421330
NOTRY=True

Committed: https://crrev.com/5f318980ce040fb8b21529e8ecc5fdbec883159f
Cr-Commit-Position: refs/heads/master@{#300254}

[tzik, 2014-10-08 06:47:07]

tzik@chromium.org changed reviewers:
+ hamaji@chromium.org, nhiroki@chromium.org

[tzik, 2014-10-08 06:47:07]

PTL

[nhiroki, 2014-10-14 03:20:01]

LGTM (sorry for my delayed response!)

[hamaji, 2014-10-14 05:28:49]

lgtm

[tzik, 2014-10-14 05:50:21]

The CQ bit was checked by tzik@chromium.org

[commit-bot: I haz the power, 2014-10-14 05:50:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/636093002/20001

[commit-bot: I haz the power, 2014-10-14 05:57:42]

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

[commit-bot: I haz the power, 2014-10-14 05:57:42]

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

[tzik, 2014-10-20 12:37:05]

The CQ bit was checked by tzik@chromium.org

[commit-bot: I haz the power, 2014-10-20 12:37:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/636093002/40001

[commit-bot: I haz the power, 2014-10-20 12:38:25]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2014-10-20 12:39:05]

Patchset 3 (id:??) landed as
https://crrev.com/5f318980ce040fb8b21529e8ecc5fdbec883159f
Cr-Commit-Position: refs/heads/master@{#300254}