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

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

CQ_EXTRA_TRYBOTS=client.skia:Test-Win8-MSVC-ShuttleB-CPU-AVX2-x86-Release-Trybot

Committed: https://skia.googlesource.com/skia/+/5a16cf654548190841b5af27af04e7995582ad7b

[mtklein, 2015-08-12 17:30:04]

The CQ bit was checked by mtklein@google.com to run a CQ dry run

[commit-bot: I haz the power, 2015-08-12 17:30:18]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1289903002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1289903002/1

[mtklein_C, 2015-08-12 17:36:58]

mtklein@chromium.org changed reviewers:
+ djsollen@google.com
- mtklein@google.com

[commit-bot: I haz the power, 2015-08-12 17:37:10]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-08-12 17:37:10]

Dry run: This issue passed the CQ dry run.

[djsollen, 2015-08-12 17:49:53]

lgtm

[mtklein, 2015-08-12 17:51:36]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-08-12 17:51:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1289903002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1289903002/1

[commit-bot: I haz the power, 2015-08-12 17:52:28]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/6028a8476504022fe40b6870b1460b5e4a80969f

[mtklein, 2015-08-12 20:51:10]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1284363002/ by mtklein@google.com.

The reason for reverting is: ?.

[mtklein_C, 2015-08-13 15:37:59]

The CQ bit was checked by mtklein@chromium.org

[commit-bot: I haz the power, 2015-08-13 15:38:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1289903002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1289903002/1

[mtklein_C, 2015-08-13 17:17:27]

The CQ bit was unchecked by mtklein@chromium.org

[mtklein_C, 2015-08-13 17:26:36]

The CQ bit was checked by mtklein@chromium.org

[mtklein_C, 2015-08-13 17:26:36]

The patchset sent to the CQ was uploaded after l-g-t-m from djsollen@google.com
Link to the patchset: https://codereview.chromium.org/1289903002/#ps20001
(title: "floats first")

[commit-bot: I haz the power, 2015-08-13 17:26:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1289903002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1289903002/20001

[mtklein_C, 2015-08-13 19:08:28]

Patchset #3 (id:40001) has been deleted

[mtklein_C, 2015-08-13 19:14:20]

The CQ bit was checked by mtklein@chromium.org

[mtklein_C, 2015-08-13 19:14:20]

The patchset sent to the CQ was uploaded after l-g-t-m from djsollen@google.com
Link to the patchset: https://codereview.chromium.org/1289903002/#ps20001
(title: "floats first")

[commit-bot: I haz the power, 2015-08-13 19:14:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1289903002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1289903002/20001

[commit-bot: I haz the power, 2015-08-13 20:10:33]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/5a16cf654548190841b5af27af04e7995582ad7b

[mtklein_C, 2015-08-13 20:45:23]

The CQ bit was checked by mtklein@chromium.org

[mtklein_C, 2015-08-13 20:45:23]

The patchset sent to the CQ was uploaded after l-g-t-m from djsollen@google.com
Link to the patchset: https://codereview.chromium.org/1289903002/#ps60001
(title: "now sk4px")

[commit-bot: I haz the power, 2015-08-13 20:45:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1289903002/60001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1289903002/60001

[commit-bot: I haz the power, 2015-08-13 23:30:32]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-08-13 23:30:33]

Try jobs failed on following builders:
  Test-Win8-MSVC-ShuttleB-CPU-AVX2-x86-Release-Trybot on client.skia
(JOB_FAILED,
http://build.chromium.org/p/client.skia/builders/Test-Win8-MSVC-ShuttleB-CPU-...)

[mtklein_C, 2015-08-18 19:24:27]

The CQ bit was checked by mtklein@chromium.org

[mtklein_C, 2015-08-18 19:24:27]

The patchset sent to the CQ was uploaded after l-g-t-m from djsollen@google.com
Link to the patchset: https://codereview.chromium.org/1289903002/#ps80001
(title: "rebase")

[commit-bot: I haz the power, 2015-08-18 19:24:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1289903002/80001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1289903002/80001

[commit-bot: I haz the power, 2015-08-18 21:42:29]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-08-18 21:42:30]

Try jobs failed on following builders:
  Test-Win8-MSVC-ShuttleB-CPU-AVX2-x86-Release-Trybot on client.skia
(JOB_FAILED,
http://build.chromium.org/p/client.skia/builders/Test-Win8-MSVC-ShuttleB-CPU-...)