Revert of Normalize SkXfermode_opts.h argument order as d,s[,aa].

Revert of Normalize SkXfermode_opts.h argument order as d,s[,aa]. (patchset #1 id:1 of https://codereview.chromium.org/1289903002/ )

Reason for revert:
?

Original issue's description:
> Normalize SkXfermode_opts.h argument order as d,s[,aa].
> 
> At head they're s,d[,aa] in SkXfermode_opts.h but Sk4px::Map* expect d,s[,aa]
> so we ended up having to write weird little lambda shims to match impedance.
> 
> There's no reason for these to disagree, and d,s[,aa] is the One True Order
> (because no matter what you're doing in graphics, there's always a dst).
> 
> Should be no perf or image diff, though I'm suspicious it might help MSVC code generation.
> 
> BUG=skia:4117
> 
> Committed: https://skia.googlesource.com/skia/+/6028a8476504022fe40b6870b1460b5e4a80969f

TBR=djsollen@google.com,mtklein@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:4117
Committed: https://skia.googlesource.com/skia/+/0010945335b497ee08ef12e1ce862ff2fefb8e01

[mtklein, 2015-08-12 20:51:11]

Created Revert of Normalize SkXfermode_opts.h argument order as d,s[,aa].

[commit-bot: I haz the power, 2015-08-12 20:51:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1284363002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1284363002/1

[commit-bot: I haz the power, 2015-08-12 20:51:30]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/0010945335b497ee08ef12e1ce862ff2fefb8e01