Fix experimental app list search box disappearing on profile switch.

Fix experimental app list search box disappearing on profile switch.

This CL stops the app list search box disappearing on profile switch.
This was happening because the search box bounds were dependent on the
contents view's bounds but was being calculated before the contents view
was laid out. Moving the search box's layout to be later fixes the issue.

BUG=459074
Committed: https://crrev.com/173f8c1d56273cab85c492c45741f3753ba41145
Cr-Commit-Position: refs/heads/master@{#317542}

[calamity, 2015-02-23 02:53:56]

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

[Matt Giuca, 2015-02-23 03:38:28]

lgtm

[calamity, 2015-02-23 03:58:35]

The CQ bit was checked by calamity@chromium.org

[commit-bot: I haz the power, 2015-02-23 03:59:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/945343002/1

[commit-bot: I haz the power, 2015-02-23 04:45:42]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-23 04:46:47]

Patchset 1 (id:??) landed as
https://crrev.com/173f8c1d56273cab85c492c45741f3753ba41145
Cr-Commit-Position: refs/heads/master@{#317542}