Make path range loading explicit

Make path range loading explicit

Requires the caller to explicitly preload paths within a range before
calling drawPaths. This allows us to remove the implicit lazy load,
thereby eliminating a redundant check on every redraw of a text blob.

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/d1201058bf73a0a5c2e19c0cc142082b1827461c

[Chris Dalton, 2015-10-01 17:15:38]

cdalton@nvidia.com changed reviewers:
+ bsalomon@google.com

[Mark Kilgard, 2015-10-01 17:46:24]

markkilgard@gmail.com changed reviewers:
+ markkilgard@gmail.com

[Mark Kilgard, 2015-10-01 17:46:24]

not a well-qualified reviewer, but see no issues

[bsalomon, 2015-10-02 14:43:02]

lgtm

[Chris Dalton, 2015-10-05 22:39:51]

The CQ bit was checked by cdalton@nvidia.com

[commit-bot: I haz the power, 2015-10-05 22:40:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1382013002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1382013002/1

[commit-bot: I haz the power, 2015-10-05 22:41:19]

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

[commit-bot: I haz the power, 2015-10-05 22:41:19]

Try jobs failed on following builders:
  Build-Mac10.8-Clang-x86_64-Release-Trybot on client.skia.compile (JOB_FAILED,
http://build.chromium.org/p/client.skia.compile/builders/Build-Mac10.8-Clang-...)

[Chris Dalton, 2015-10-05 22:49:40]

The CQ bit was checked by cdalton@nvidia.com

[Chris Dalton, 2015-10-05 22:49:41]

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/1382013002/#ps20001
(title: "Fix clang build")

[commit-bot: I haz the power, 2015-10-05 22:49:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1382013002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1382013002/20001

[commit-bot: I haz the power, 2015-10-05 22:56:39]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/d1201058bf73a0a5c2e19c0cc142082b1827461c