Override setDrawFilter() in SkColorSpaceXformCanvas

Fixes cts tests.

b/37161109
b/37237678

Bug: skia:
Change-Id: I12d78b631b4056a78cbbb2962144e8cc62eb931a
Reviewed-on: https://skia-review.googlesource.com/13244
Commit-Queue: Matt Sarett <msarett@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
1 file changed