Rebaseline verylargebitmap

BUG=skia:

Review URL: https://codereview.chromium.org/778693002
Decompose a weird assert.

I got my hands on a list of new warnings coming out of MSVC when run with /analyze.

I scanned over them and didn't see any bugs, but I did notice this is just a weird
way to write this expression. (MSVC /analyze was wary of '=' in a boolean expression.)

BUG=skia:

Review URL: https://codereview.chromium.org/776033002
update tileimagefilter gm expectations

TBR=reed@google.com

NOTRY=true

Review URL: https://codereview.chromium.org/777683002
bug fix for cubic low precision

TBR=
BUG=skia:

Review URL: https://codereview.chromium.org/776953002
remove unused device::eraseColor

BUG=skia:
TBR=

Review URL: https://codereview.chromium.org/765643004