Add transition animations to thumbnail updates in list view.

Add transition animations to thumbnail updates in list view.

BUG=456016
TEST=manually tested; Edit some file in list view and see the thumbnail is updated with transition animation.

Committed: https://crrev.com/ae645f0e259c5af4681209429c814c0573a4a87e
Cr-Commit-Position: refs/heads/master@{#318679}

[yawano, 2015-02-26 09:15:32]

yawano@chromium.org changed reviewers:
+ fukino@chromium.org

[yawano, 2015-02-26 09:15:33]

PTAL. Thank you!

[fukino, 2015-03-02 08:19:52]

On 2015/02/26 09:15:33, yawano wrote:
> PTAL. Thank you!

https://codereview.chromium.org/962103002/ has landed, which will make conflict.
Could you rebase this CL? Sorry for inconvenience.

[yawano, 2015-03-02 09:16:38]

Rebased the CL. PTAL. Thank you!

[fukino, 2015-03-02 10:01:01]

lgtm. Thank you!

[yawano, 2015-03-02 10:01:32]

On 2015/03/02 10:01:01, fukino wrote:
> lgtm. Thank you!

Thank you!

[yawano, 2015-03-02 10:01:36]

The CQ bit was checked by yawano@chromium.org

[commit-bot: I haz the power, 2015-03-02 10:07:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/954373003/20001

[commit-bot: I haz the power, 2015-03-02 10:21:44]

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

[commit-bot: I haz the power, 2015-03-02 10:21:45]

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

[yawano, 2015-03-02 10:58:02]

The CQ bit was checked by yawano@chromium.org

[yawano, 2015-03-02 10:58:03]

The patchset sent to the CQ was uploaded after l-g-t-m from fukino@chromium.org
Link to the patchset: https://codereview.chromium.org/954373003/#ps40001 (title:
"Fix to pass presubmit.")

[commit-bot: I haz the power, 2015-03-02 10:59:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/954373003/40001

[commit-bot: I haz the power, 2015-03-02 11:33:00]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-03-02 11:33:27]

Patchset 3 (id:??) landed as
https://crrev.com/ae645f0e259c5af4681209429c814c0573a4a87e
Cr-Commit-Position: refs/heads/master@{#318679}