Remove draw window size state from SkDebugCanvas

Remove draw window size state from SkDebugCanvas

The SkDebugCanvas can be (or is currently) being used to draw to multiple
different canvases. If this use-case is intended, then storing draw
-related state in the canvas causes bugs.

Remove draw window size state form SkDebugCanvas. Instead, use the canvas
base layer size as the window size to clip to. This is consistent with
the current use in debugger.

This is part of work trying to remove bugs in debugger that result from
replaying one SkDrawCanvas to two different canvases. Currently the
SkDrawCanvas stores state that can only be valid if it is used for one
canvas.

Committed: https://skia.googlesource.com/skia/+/26e5400de4db969d32356a0b703261c1c98735f6

[Kimmo Kinnunen, 2015-01-05 12:47:57]

kkinnunen@nvidia.com changed reviewers:
+ robertphillips@google.com

[robertphillips, 2015-01-05 20:48:42]

lgtm

[robertphillips, 2015-01-05 20:48:45]

The CQ bit was checked by robertphillips@google.com

[commit-bot: I haz the power, 2015-01-05 20:49:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/835113002/20001

[commit-bot: I haz the power, 2015-01-05 20:58:59]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/26e5400de4db969d32356a0b703261c1c98735f6