[WebApk] Installation adds a homescreen shortcut.

[WebApk] Installation adds a homescreen shortcut.

Since installation is going through package installer directly and not
play, a shortcut isn't created. Add logic to listen for package
installation and manually create a shortcut (there is no callback/event
that can be listened to). Note if chrome is evicted, a shortcut won't be
created. As this is a temporary solution, it should be fine for now.
BUG=636107
Committed: https://crrev.com/723c87a310a6ed30e88292f046b2c19a1d33660f
Cr-Commit-Position: refs/heads/master@{#413534}

[Xi Han, 2016-08-22 19:47:14]

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

[Xi Han, 2016-08-22 19:47:15]

This is a copy of Yaron's CL(https://codereview.chromium.org/2247183008/), and I
just rebase and addressed the original comments. PTAL, thanks!

[gone, 2016-08-22 19:50:39]

lgtm

[Xi Han, 2016-08-22 19:51:00]

The CQ bit was checked by hanxi@chromium.org

[commit-bot: I haz the power, 2016-08-22 19:51:53]

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, 2016-08-22 21:13:03]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-22 21:20:39]

Description was changed from

==========
[WebApk] Installation adds a homescreen shortcut.

Since installation is going through package installer directly and not
play, a shortcut isn't created. Add logic to listen for package
installation and manually create a shortcut (there is no callback/event
that can be listened to). Note if chrome is evicted, a shortcut won't be
created. As this is a temporary solution, it should be fine for now.
BUG=636107
==========

to

==========
[WebApk] Installation adds a homescreen shortcut.

Since installation is going through package installer directly and not
play, a shortcut isn't created. Add logic to listen for package
installation and manually create a shortcut (there is no callback/event
that can be listened to). Note if chrome is evicted, a shortcut won't be
created. As this is a temporary solution, it should be fine for now.
BUG=636107

Committed: https://crrev.com/723c87a310a6ed30e88292f046b2c19a1d33660f
Cr-Commit-Position: refs/heads/master@{#413534}
==========

[commit-bot: I haz the power, 2016-08-22 21:20:40]

Patchset 1 (id:??) landed as
https://crrev.com/723c87a310a6ed30e88292f046b2c19a1d33660f
Cr-Commit-Position: refs/heads/master@{#413534}