rebaseline after gradient fix

BUG=skia:
TBR=
NOTRY=True

Review URL: https://codereview.chromium.org/821703002
Add XP to handle the cases where we disable color write.

BUG=skia:

Review URL: https://codereview.chromium.org/787233003
remove dead SK_SUPPORT_LEGACY_IMAGEDECODER_CHOOSER code

BUG=skia:

Review URL: https://codereview.chromium.org/816273002
Add sRGB texture support.

Review URL: https://codereview.chromium.org/791823003
reenable complexclip3 for gpu

Review URL: https://codereview.chromium.org/814273003