remove unnecessary copies

remove unnecessary copies

these used to matter with pass-by-ref

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1721153002

Committed: https://skia.googlesource.com/skia/+/888934723db64ebecb0d6e577ba7b70689d83dd2

[mtklein_C, 2016-02-23 00:23:54]

Description was changed from

==========
remove unnecessary copies

these used to matter with pass-by-ref

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

to

==========
remove unnecessary copies

these used to matter with pass-by-ref

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

[mtklein, 2016-02-23 00:30:32]

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

[mtklein_C, 2016-02-23 00:30:44]

mtklein@chromium.org changed reviewers:
+ herb@google.com
- mtklein@google.com

[commit-bot: I haz the power, 2016-02-23 00:30:45]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1721153002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1721153002/1

[herb_g, 2016-02-23 00:33:40]

lgtm

[commit-bot: I haz the power, 2016-02-23 00:51:48]

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

[commit-bot: I haz the power, 2016-02-23 00:51:48]

Dry run: This issue passed the CQ dry run.

[mtklein_C, 2016-02-23 00:55:07]

The CQ bit was checked by mtklein@chromium.org

[commit-bot: I haz the power, 2016-02-23 00:55:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1721153002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1721153002/1

[commit-bot: I haz the power, 2016-02-23 00:56:03]

Description was changed from

==========
remove unnecessary copies

these used to matter with pass-by-ref

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

to

==========
remove unnecessary copies

these used to matter with pass-by-ref

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...

Committed:
https://skia.googlesource.com/skia/+/888934723db64ebecb0d6e577ba7b70689d83dd2
==========

[commit-bot: I haz the power, 2016-02-23 00:56:04]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/888934723db64ebecb0d6e577ba7b70689d83dd2