Fix font preload crash

Fix font preload crash

Adds null check for return value of FontResource::fetch(), as well as a
test exercising that code path.

BUG=600766
Committed: https://crrev.com/1470667b97b1ce551060d595f0d41656526ad0f7
Cr-Commit-Position: refs/heads/master@{#385400}

[Kunihiko Sakamoto, 2016-04-06 06:04:40]

Description was changed from

==========
Fix font preload crash

BUG=600766
==========

to

==========
Fix font preload crash

FontResource::fetch can return nullptr.

Also adding a test that exercises that code path.

BUG=600766
==========

[Kunihiko Sakamoto, 2016-04-06 06:28:39]

Description was changed from

==========
Fix font preload crash

FontResource::fetch can return nullptr.

Also adding a test that exercises that code path.

BUG=600766
==========

to

==========
Fix font preload crash

Adds null check for return value of FontResource::fetch(), as well as a
test exercising that code path.

BUG=600766
==========

[Kunihiko Sakamoto, 2016-04-06 06:39:14]

ksakamoto@chromium.org changed reviewers:
+ japhet@chromium.org, yoav@yoav.ws

[Yoav Weiss, 2016-04-06 06:51:00]

On 2016/04/06 06:39:15, Kunihiko Sakamoto wrote:

LGTM! Thanks for fixing that.

[Kunihiko Sakamoto, 2016-04-06 06:55:42]

The CQ bit was checked by ksakamoto@chromium.org

[commit-bot: I haz the power, 2016-04-06 06:56:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1867493002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1867493002/1

[commit-bot: I haz the power, 2016-04-06 08:18:48]

Description was changed from

==========
Fix font preload crash

Adds null check for return value of FontResource::fetch(), as well as a
test exercising that code path.

BUG=600766
==========

to

==========
Fix font preload crash

Adds null check for return value of FontResource::fetch(), as well as a
test exercising that code path.

BUG=600766
==========

[commit-bot: I haz the power, 2016-04-06 08:18:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-06 08:20:23]

Description was changed from

==========
Fix font preload crash

Adds null check for return value of FontResource::fetch(), as well as a
test exercising that code path.

BUG=600766
==========

to

==========
Fix font preload crash

Adds null check for return value of FontResource::fetch(), as well as a
test exercising that code path.

BUG=600766

Committed: https://crrev.com/1470667b97b1ce551060d595f0d41656526ad0f7
Cr-Commit-Position: refs/heads/master@{#385400}
==========

[commit-bot: I haz the power, 2016-04-06 08:20:24]

Patchset 1 (id:??) landed as
https://crrev.com/1470667b97b1ce551060d595f0d41656526ad0f7
Cr-Commit-Position: refs/heads/master@{#385400}