Make BBH parameter to SkRecordComputeLayers and SkRecordFillBounds optional

Make BBH parameter to SkRecordComputeLayers and SkRecordFillBounds optional

Chromium creates a picture to contain their picture pile in order to use MultiPictureDraw. They currently do not create a bounding box for that picture but I still need layer information for it. This change allows Chromium to continue without a BBH but still have layer information.

In the future, the brute force BBH might be suitable for their use case.

Please see gpu_raster_worker_pool.cc in (Add flag to beginRecording to request saveLayer information - https://codereview.chromium.org/721883002/) for where this is happening in Chromium.

Committed: https://skia.googlesource.com/skia/+/8910879098694c61267e21789d933928c1b7995e

[robertphillips, 2014-11-17 14:59:02]

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

[mtklein, 2014-11-17 15:20:26]

lgtm

[robertphillips, 2014-11-17 15:44:39]

The CQ bit was checked by robertphillips@google.com

[commit-bot: I haz the power, 2014-11-17 15:44:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/733963004/1

[commit-bot: I haz the power, 2014-11-17 16:16:19]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/8910879098694c61267e21789d933928c1b7995e

[robertphillips, 2014-11-17 19:19:22]

Patchset #2 (id:20001) has been deleted