More ignores for complexclip2

TBR=
NOTRY=True
NOTREECHECKS=True
BUG=skia:

Review URL: https://codereview.chromium.org/814133003
rebaseline Nexus GMs

BUG=skia:
TBR=
NOTRY=True
NOTREECHECKS=True

Review URL: https://codereview.chromium.org/811263004
add const to encodePixels pixel parameter

BUG=skia:

Review URL: https://codereview.chromium.org/788143007
When bitmap is texture backed, don't download and reupload pixels

Review URL: https://codereview.chromium.org/820683002
fix SK_LEGACY_ENCODE_BITMAP missing cast

BUG=skia:
TBR=
NOTRY=True
NOTREECHECKS=True

Review URL: https://codereview.chromium.org/815223002
rebaselines after gradient fix

BUG=skia:
TBR=
NOTRY=True
NOTREECHECKS=True

Review URL: https://codereview.chromium.org/818853002
initial changes to add local matrix to primitive processor

BUG=skia:

Review URL: https://codereview.chromium.org/820523002