Resubmit SK_SUPPORT_LEGACY_GRADIENT_DITHERING related tests for rebaselining.
Resubmit SK_SUPPORT_LEGACY_GRADIENT_DITHERING related tests for rebaselining.

Original change: https://chromium.googlesource.com/chromium/src/+/a88cbcc7e

BUG=542763,skia:4436
TBR=fmalita@chromium.org,reed@google.com
NOTRY=true

Review URL: https://codereview.chromium.org/1412793002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#354574}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk