[Sync] Enable migration from directory to USS.

[Sync] Enable migration from directory to USS.

This change injects the function that actually migrates directory data
and metadata to USS. This process is designed as purely a bandwidth
optimization for users, and reuses the normal initial merge machinery.

BUG=658002
Committed: https://crrev.com/15a108882f342fd75e7dd3522234189924055943
Cr-Commit-Position: refs/heads/master@{#441529}

[maxbogue, 2017-01-04 23:14:07]

The CQ bit was checked by maxbogue@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-01-04 23:14:39]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-01-05 00:14:00]

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

[commit-bot: I haz the power, 2017-01-05 00:14:01]

Dry run: This issue passed the CQ dry run.

[maxbogue, 2017-01-05 00:16:51]

maxbogue@chromium.org changed reviewers:
+ skym@chromium.org

[maxbogue, 2017-01-05 00:16:51]

Sky, PTAL!

[skym, 2017-01-05 00:27:46]

lgtm

[maxbogue, 2017-01-05 00:29:52]

The CQ bit was checked by maxbogue@chromium.org

[commit-bot: I haz the power, 2017-01-05 00:30:25]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-01-05 00:36:43]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1483576192795070, "parent_rev":
"a109a32c9699e05e0d60acfc83560d58c35ae2fc", "commit_rev":
"75edd44de0572e1aba26628f7363404626be82d6"}

[commit-bot: I haz the power, 2017-01-05 00:37:13]

Description was changed from

==========
[Sync] Enable migration from directory to USS.

This change injects the function that actually migrates directory data
and metadata to USS. This process is designed as purely a bandwidth
optimization for users, and reuses the normal initial merge machinery.

BUG=658002
==========

to

==========
[Sync] Enable migration from directory to USS.

This change injects the function that actually migrates directory data
and metadata to USS. This process is designed as purely a bandwidth
optimization for users, and reuses the normal initial merge machinery.

BUG=658002

Review-Url: https://codereview.chromium.org/2614773003
==========

[commit-bot: I haz the power, 2017-01-05 00:37:14]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2017-01-05 00:39:17]

Description was changed from

==========
[Sync] Enable migration from directory to USS.

This change injects the function that actually migrates directory data
and metadata to USS. This process is designed as purely a bandwidth
optimization for users, and reuses the normal initial merge machinery.

BUG=658002

Review-Url: https://codereview.chromium.org/2614773003
==========

to

==========
[Sync] Enable migration from directory to USS.

This change injects the function that actually migrates directory data
and metadata to USS. This process is designed as purely a bandwidth
optimization for users, and reuses the normal initial merge machinery.

BUG=658002

Committed: https://crrev.com/15a108882f342fd75e7dd3522234189924055943
Cr-Commit-Position: refs/heads/master@{#441529}
==========

[commit-bot: I haz the power, 2017-01-05 00:39:18]

Patchset 1 (id:??) landed as
https://crrev.com/15a108882f342fd75e7dd3522234189924055943
Cr-Commit-Position: refs/heads/master@{#441529}