Fix apps sometimes not showing up in the app list search results.

Fix apps sometimes not showing up in the app list search results.

This CL fixes an issue with the experimental app list search where the
app results would sometimes not show up. This was being caused by the
display type not being updated when the result was copied from the
mixer, causing recommendation results not to change into tile results.

BUG=456060
Committed: https://crrev.com/222650396e5a4a40891362bc7f660b9b73dd3ed4
Cr-Commit-Position: refs/heads/master@{#315264}

[calamity, 2015-02-09 02:29:24]

calamity@chromium.org changed reviewers:
+ mgiuca@chromium.org

[Matt Giuca, 2015-02-09 02:43:00]

lgtm

[calamity, 2015-02-09 03:54:47]

The CQ bit was checked by calamity@chromium.org

[commit-bot: I haz the power, 2015-02-09 03:55:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/909773002/1

[commit-bot: I haz the power, 2015-02-09 04:37:16]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-09 04:37:37]

Patchset 1 (id:??) landed as
https://crrev.com/222650396e5a4a40891362bc7f660b9b73dd3ed4
Cr-Commit-Position: refs/heads/master@{#315264}