Make the app list speech view query able to span multiple lines.

Make the app list speech view query able to span multiple lines.

This CL makes the app list speech view query able to span multiple lines.
This was made possible by a change in Label which drastically speeds up
layout of a label. which has to happen each time the query string changes.

BUG=443762
Committed: https://crrev.com/35e95fe3ca6f8ad9b9b037f7d6b69872f740705c
Cr-Commit-Position: refs/heads/master@{#321950}

[calamity, 2015-03-23 03:40:10]

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

[Matt Giuca, 2015-03-24 06:29:00]

lgtm

[calamity, 2015-03-24 07:07:20]

The CQ bit was checked by calamity@chromium.org

[commit-bot: I haz the power, 2015-03-24 07:07:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1028023002/1

[commit-bot: I haz the power, 2015-03-24 08:03:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-24 08:03:53]

Patchset 1 (id:??) landed as
https://crrev.com/35e95fe3ca6f8ad9b9b037f7d6b69872f740705c
Cr-Commit-Position: refs/heads/master@{#321950}