add cast for tostring

add cast for tostring to fix google3

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2385353002

TBR=True
NOTRY=True

Committed: https://skia.googlesource.com/skia/+/4cfd5af26e5fab1699cfa2ab40d49c24cededd72

[reed1, 2016-10-03 21:18:55]

Description was changed from

==========
add cast for tostring

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

to

==========
add cast for tostring

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2385353002
==========

[reed1, 2016-10-03 21:19:39]

Description was changed from

==========
add cast for tostring

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2385353002
==========

to

==========
add cast for tostring to fix google3

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2385353002

TBR=True
NOTRY=True
==========

[reed1, 2016-10-03 21:19:44]

The CQ bit was checked by reed@google.com

[commit-bot: I haz the power, 2016-10-03 21:19:46]

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, 2016-10-03 21:20:43]

Description was changed from

==========
add cast for tostring to fix google3

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2385353002

TBR=True
NOTRY=True
==========

to

==========
add cast for tostring to fix google3

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2385353002

TBR=True
NOTRY=True

Committed:
https://skia.googlesource.com/skia/+/4cfd5af26e5fab1699cfa2ab40d49c24cededd72
==========

[commit-bot: I haz the power, 2016-10-03 21:20:44]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/4cfd5af26e5fab1699cfa2ab40d49c24cededd72

[reed1, 2016-10-03 21:33:38]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/2384303002/ by reed@google.com.

The reason for reverting is: base CL has legacy skp bug, so have to revert it.