[SyncFS] Run LocalToRemoteSyncer as SyncTask

[SyncFS] Run LocalToRemoteSyncer as SyncTask

 * Replace base class of LocalToRemoteSyncer with SyncTask
 * Add testing SyncTaskToken.
 * Clean up LocalToRemoteSyncer implementation.

BUG=344769
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=272494

[tzik, 2014-05-22 05:16:54]

PTL

[peria, 2014-05-22 05:45:47]

lgtm

[nhiroki, 2014-05-22 08:19:31]

LGTM after fixing compile failure

https://codereview.chromium.org/297803011/diff/1/chrome/browser/sync_file_sys...
File chrome/browser/sync_file_system/drive_backend/local_to_remote_syncer.cc
(right):

https://codereview.chromium.org/297803011/diff/1/chrome/browser/sync_file_sys...
chrome/browser/sync_file_system/drive_backend/local_to_remote_syncer.cc:194: 
nit: there is an extra empty line.

[tzik, 2014-05-23 04:44:58]

https://codereview.chromium.org/297803011/diff/1/chrome/browser/sync_file_sys...
File chrome/browser/sync_file_system/drive_backend/local_to_remote_syncer.cc
(right):

https://codereview.chromium.org/297803011/diff/1/chrome/browser/sync_file_sys...
chrome/browser/sync_file_system/drive_backend/local_to_remote_syncer.cc:194: 
On 2014/05/22 08:19:32, nhiroki wrote:
> nit: there is an extra empty line.

Done.

[tzik, 2014-05-23 04:46:25]

The CQ bit was checked by tzik@chromium.org

[commit-bot: I haz the power, 2014-05-23 04:47:33]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tzik@chromium.org/297803011/20001

[commit-bot: I haz the power, 2014-05-23 11:39:33]

Change committed as 272494