Revert "remove SkClipVisitor"

Revert "remove SkClipVisitor"

This reverts commit 91b961d33d1d3e78c212be8738c1c7c468c358ca.

Reason for revert: need to update caller in android

Original change's description:
> remove SkClipVisitor
>
> With new device clipping, this is unsupported on SkCanvas
>
> BUG=skia:
>
> Change-Id: I39443f213be1005b8b9208d604e4bfb31cbda424
> Reviewed-on: https://skia-review.googlesource.com/9349
> Commit-Queue: Mike Reed <reed@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Robert Phillips <robertphillips@google.com>
>

TBR=bsalomon@google.com,robertphillips@google.com,reed@google.com,reviews@skia.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Change-Id: I22df0c66ec564ca32355179d2ee5ea14bff7b1d5
Reviewed-on: https://skia-review.googlesource.com/9456
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>