Record whenever an app is launched from the Home screen.

Record whenever an app is launched from the Home screen.

Because Android's API doesn't let us know when a user has
deleted a shortcut from the home screen, record that the
shortcut still exists whenever the shortcut is launched.
This applies to both regular shortcuts and web app launches.

BUG=460229
Committed: https://crrev.com/d33801eb4a0d31a5020a400c8b121dc68d829826
Cr-Commit-Position: refs/heads/master@{#329940}

[gone, 2015-05-14 19:23:23]

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

[Ted C, 2015-05-14 21:10:13]

lgtm

[gone, 2015-05-14 21:10:30]

The CQ bit was checked by dfalcantara@chromium.org

[commit-bot: I haz the power, 2015-05-14 21:13:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1129293009/1

[commit-bot: I haz the power, 2015-05-14 21:42:11]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-14 21:43:02]

Patchset 1 (id:??) landed as
https://crrev.com/d33801eb4a0d31a5020a400c8b121dc68d829826
Cr-Commit-Position: refs/heads/master@{#329940}