[Downloads] Animate the DateDividedAdapter

[Downloads] Animate the DateDividedAdapter

Add support for stable IDs in the DateDividedAdapter, which allows the
RecyclerView to automatically determine what needs to be animated when
the data set changes.

The IDs for Date headers are based on the day and year of the header,
while the DownloadHistoryItemWrapper combines part of the download's
timestamp with its hashed GUID.

BUG=616324
Committed: https://crrev.com/685ed8792c5ff5847aee0c02239aafe36a86809b
Cr-Commit-Position: refs/heads/master@{#413040}

[gone, 2016-08-18 04:21:02]

dfalcantara@chromium.org changed reviewers:
+ ianwen@chromium.org

[gone, 2016-08-18 04:21:03]

This builds on top of the testing CL, unfortunately, so if we want pretty
animations you've got to review that one first :/

[gone, 2016-08-18 19:38:49]

dfalcantara@chromium.org changed reviewers:
+ twellington@chromium.org
- ianwen@chromium.org

[gone, 2016-08-18 19:38:49]

Swapping over...

[Theresa, 2016-08-18 19:44:28]

lgtm

[gone, 2016-08-18 23:23:06]

The CQ bit was checked by dfalcantara@chromium.org

[gone, 2016-08-18 23:23:07]

The patchset sent to the CQ was uploaded after l-g-t-m from
twellington@chromium.org
Link to the patchset: https://chromiumcodereview.appspot.com/2251343002/#ps20001
(title: "Rebasing")

[gone, 2016-08-18 23:23:07]

The CQ bit was unchecked by dfalcantara@chromium.org

[gone, 2016-08-19 02:16:03]

The CQ bit was checked by dfalcantara@chromium.org

[commit-bot: I haz the power, 2016-08-19 02:16:27]

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, 2016-08-19 03:05:05]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-08-19 03:09:06]

Description was changed from

==========
[Downloads] Animate the DateDividedAdapter

Add support for stable IDs in the DateDividedAdapter, which allows the
RecyclerView to automatically determine what needs to be animated when
the data set changes.

The IDs for Date headers are based on the day and year of the header,
while the DownloadHistoryItemWrapper combines part of the download's
timestamp with its hashed GUID.

BUG=616324
==========

to

==========
[Downloads] Animate the DateDividedAdapter

Add support for stable IDs in the DateDividedAdapter, which allows the
RecyclerView to automatically determine what needs to be animated when
the data set changes.

The IDs for Date headers are based on the day and year of the header,
while the DownloadHistoryItemWrapper combines part of the download's
timestamp with its hashed GUID.

BUG=616324

Committed: https://crrev.com/685ed8792c5ff5847aee0c02239aafe36a86809b
Cr-Commit-Position: refs/heads/master@{#413040}
==========

[commit-bot: I haz the power, 2016-08-19 03:09:07]

Patchset 2 (id:??) landed as
https://crrev.com/685ed8792c5ff5847aee0c02239aafe36a86809b
Cr-Commit-Position: refs/heads/master@{#413040}