A small cleanup of GrAtlasTextContext

A small cleanup of GrAtlasTextContext

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/18b072dbcb2df81945b87449b591c4b244e7fa37

[joshualitt, 2015-12-07 19:42:56]

joshualitt@google.com changed reviewers:
+ bsalomon@google.com, joshualitt@google.com, jvanverth@google.com

[joshualitt, 2015-12-07 19:42:56]

This code moves the glyph appending routine to internal to textblob itself, and
also removes another egregious abuse of the internals of GrAtlasTextBlob.

[bsalomon, 2015-12-07 19:49:45]

lgtm

[joshualitt, 2015-12-07 19:58:37]

The CQ bit was checked by joshualitt@google.com

[commit-bot: I haz the power, 2015-12-07 19:58:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1502323002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1502323002/20001

[joshualitt, 2015-12-07 20:10:49]

The CQ bit was unchecked by joshualitt@google.com

[joshualitt, 2015-12-07 20:11:55]

The CQ bit was checked by joshualitt@google.com

[joshualitt, 2015-12-07 20:11:56]

The patchset sent to the CQ was uploaded after l-g-t-m from bsalomon@google.com
Link to the patchset: https://codereview.chromium.org/1502323002/#ps40001
(title: "fix refcount issue")

[commit-bot: I haz the power, 2015-12-07 20:12:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1502323002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1502323002/40001

[commit-bot: I haz the power, 2015-12-07 20:26:14]

Description was changed from

==========
A small cleanup of GrAtlasTextContext

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

to

==========
A small cleanup of GrAtlasTextContext

BUG=skia:

Committed:
https://skia.googlesource.com/skia/+/18b072dbcb2df81945b87449b591c4b244e7fa37
==========

[commit-bot: I haz the power, 2015-12-07 20:26:15]

Committed patchset #3 (id:40001) as
https://skia.googlesource.com/skia/+/18b072dbcb2df81945b87449b591c4b244e7fa37