SkPDF: do not assert when openStream return nullptr

SkPDF: do not assert when openStream return nullptr

BUG=163892
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2332813002

Committed: https://skia.googlesource.com/skia/+/2a4d1e1c1f574e3ee99ae0e3a47ef24f635b9b16

[hal.canary, 2016-09-12 14:53:54]

Description was changed from

==========
SkPDF: do not assert when openStream return nullptr

BUG=skia:
==========

to

==========
SkPDF: do not assert when openStream return nullptr

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2332813002
==========

[hal.canary, 2016-09-12 14:55:00]

The CQ bit was checked by halcanary@google.com to run a CQ dry run

[commit-bot: I haz the power, 2016-09-12 14:55:09]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[hal.canary, 2016-09-12 15:00:13]

Description was changed from

==========
SkPDF: do not assert when openStream return nullptr

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2332813002
==========

to

==========
SkPDF: do not assert when openStream return nullptr

BUG=163892
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2332813002
==========

[hal.canary, 2016-09-12 15:00:14]

halcanary@google.com changed reviewers:
+ thestig@chromium.org

[commit-bot: I haz the power, 2016-09-12 15:21:32]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-09-12 15:21:33]

Dry run: This issue passed the CQ dry run.

[Lei Zhang, 2016-09-22 00:31:06]

lgtm

[hal.canary, 2016-09-22 20:42:36]

The CQ bit was checked by halcanary@google.com

[commit-bot: I haz the power, 2016-09-22 20:42:42]

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, 2016-09-22 21:13:17]

Description was changed from

==========
SkPDF: do not assert when openStream return nullptr

BUG=163892
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2332813002
==========

to

==========
SkPDF: do not assert when openStream return nullptr

BUG=163892
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2332813002

Committed:
https://skia.googlesource.com/skia/+/2a4d1e1c1f574e3ee99ae0e3a47ef24f635b9b16
==========

[commit-bot: I haz the power, 2016-09-22 21:13:18]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/2a4d1e1c1f574e3ee99ae0e3a47ef24f635b9b16