[Retry] SyncFS: store disabled origins in DriveMetadataStore

[Retry] SyncFS: store disabled origins in DriveMetadataStore

Store disabled origins when extensions are disabled. Current implementation stores origins only for installed and enabled apps (i.e. batch sync origins and incremental sync origins). Therefore we cannot access files and metadata related to installed but disabled apps.

This makes a difference between installing/uninstalling and enabling/disabling extensions.
- register an origin when an extension is launched for the first time.
- disable the origin when the extension is disabled (not unregister).
- enable the origin when the extension is enabled.
- unregister the origin when the extension is uninstalled.

Original review: https://codereview.chromium.org/12744008/

BUG=184742
TEST=unit_test
TEST=manual test (launch, reload, restart, disable, enable and uninstall an app)
TBR=kinuko,tzik,calvinlo


Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=189228

[nhiroki, 2013-03-20 01:11:00]

TBR-ing to original reviewers since there is no change from original review.

[commit-bot: I haz the power, 2013-03-20 01:16:22]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/nhiroki@chromium.org/12789007/1

[commit-bot: I haz the power, 2013-03-20 09:24:28]

Change committed as 189228