change canvas-state to just record clip bounds

This reflects the long-standing restrictions in our clients (webview) and the reality of the gpu target which just uses scissors.

It also removes one of the few callers of canvas::clipRegion, which we'd like to remove.

Bug: skia:
Change-Id: Ie3b3c6e8752f82cddef256f753000f9da4bdbdee
Reviewed-on: https://skia-review.googlesource.com/113260
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Mike Reed <reed@google.com>
3 files changed