Switch textures created by DeviceImageFilterProxy to
approx-match.
This revealed some further 0..1 texture coordinate
depedencies,specifically in SkDisplacementMapEffect and
SkXfermodeImageFilter, fixed through use of
GrTextureDomain.
Note: causes minor pixel diffs in pictureimagefilter,
testimagefilters GMs.
Also causes minor pixel diffs in some Blink layout tests,
suppressed here: https://codereview.chromium.org/1064943002
BUG=skia:3532
Review URL: https://codereview.chromium.org/1065683002
3 files changed