Detach cache in DF routines rather than passing it in.

Detach cache in DF routines rather than passing it in.

This removes nesting of cache accesses, which avoids a possible
deadlock condition when the caches are the same.

Committed: https://skia.googlesource.com/skia/+/157e6483fb089bf4d2e5cd2c18b521e5ab4ff32a

[jvanverth1, 2015-09-09 14:54:55]

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

[joshualitt, 2015-09-09 14:59:06]

On 2015/09/09 14:54:55, jvanverth1 wrote:

lgtm

[jvanverth1, 2015-09-09 15:00:21]

The CQ bit was checked by jvanverth@google.com

[commit-bot: I haz the power, 2015-09-09 15:00:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1310513008/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1310513008/1

[commit-bot: I haz the power, 2015-09-09 15:05:17]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/157e6483fb089bf4d2e5cd2c18b521e5ab4ff32a

[herb_g, 2015-09-09 15:41:01]

lgtm