Minor cleanup of clip mask manager

Minor cleanup of clip mask manager

Follow up to https://codereview.chromium.org/1418073005/ (Remove gpu-side clip mask merging from clip mask manager).

The path renderer chain is only ever allocated when it is about to be used (so the delayed initialization doesn't buy us anything).

We can now reduce the lifetime of the pipelineBuilder in createAlphaClipMask

Committed: https://skia.googlesource.com/skia/+/13391dd97209f36c71bc18cc75084f74c2f6af15

[robertphillips, 2015-10-29 19:44:44]

Description was changed from

==========
Minor cleanup of clip mask manager
==========

to

==========
Minor cleanup of clip mask manager

Follow up to https://codereview.chromium.org/1418073005/ (Remove gpu-side clip
mask merging from clip mask manager).

The path renderer chain is only ever allocated when it is about to be used (so
the delayed initialization doesn't buy us anything).

We can now reduce the lifetime of the pipelineBuilder in createAlphaClipMask
==========

[robertphillips, 2015-10-29 19:44:44]

Description was changed from

==========
Minor cleanup of clip mask manager
==========

to

==========
Minor cleanup of clip mask manager

Follow up to https://codereview.chromium.org/1418073005/ (Remove gpu-side clip
mask merging from clip mask manager).

The path renderer chain is only ever allocated when it is about to be used (so
the delayed initialization doesn't buy us anything).

We can now reduce the lifetime of the pipelineBuilder in createAlphaClipMask
==========

[robertphillips, 2015-10-29 19:44:44]

robertphillips@google.com changed reviewers:
+ bsalomon@google.com

[robertphillips, 2015-10-29 19:44:44]

robertphillips@google.com changed reviewers:
+ bsalomon@google.com

[bsalomon, 2015-10-29 19:55:18]

lgtm

[robertphillips, 2015-10-29 19:56:09]

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

[commit-bot: I haz the power, 2015-10-29 19:56:16]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1416113006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1416113006/1

[commit-bot: I haz the power, 2015-10-29 20:09:02]

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

[commit-bot: I haz the power, 2015-10-29 20:09:03]

Dry run: This issue passed the CQ dry run.

[robertphillips, 2015-10-30 12:14:18]

The CQ bit was checked by robertphillips@google.com

[commit-bot: I haz the power, 2015-10-30 12:14:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1416113006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1416113006/1

[commit-bot: I haz the power, 2015-10-30 12:15:16]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/13391dd97209f36c71bc18cc75084f74c2f6af15