Add last_modified to CopyResource and MoveResource.

Add last_modified to CopyResource and MoveResource.

This CL adds last_modified to the CopyResource and MoveResource to the
DriveServiceInterface to implement preserving last modified date on Copy and
Move. The feature is only supported on Drive API v2, as GData WAPI doesn't have
such a function.

BUG=282107
TEST=Ran unit_tests

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=224974

[hidehiko, 2013-09-24 04:47:54]

Thank you for your review in advance,
- hidehiko

[kinaba, 2013-09-24 05:20:05]

lgtm

[commit-bot: I haz the power, 2013-09-24 06:17:53]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/hidehiko@chromium.org/23591067/1

[commit-bot: I haz the power, 2013-09-24 09:20:08]

Retried try job too often on linux_aura for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_aura...

[commit-bot: I haz the power, 2013-09-24 09:21:31]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/hidehiko@chromium.org/23591067/1

[commit-bot: I haz the power, 2013-09-24 11:03:03]

Change committed as 224974