Revert of De-proc Color32

Revert of De-proc Color32 (patchset #4 id:60001 of https://codereview.chromium.org/1104183004/)

Reason for revert:
MIPS

Original issue's description:
> De-proc Color32
> 
> Also strips SK_SUPPORT_LEGACY_COLOR32_MATH,
> which is no longer needed.
> 
> Seems handy to have SkTypes include the relevant intrinsics when
> we know we've got them, but I'm not married to it.
> 
> Locally this looks like a pointlessly small perf win, but I'm mostly
> keen to get all the code together.
> 
> BUG=skia:
> 
> Committed: https://skia.googlesource.com/skia/+/376e9bc206b69d9190f38dfebb132a8769bbd72b

TBR=reed@google.com,mtklein@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed: https://skia.googlesource.com/skia/+/498856ebc6f22d7018071bd6696756d7cd077ab8

[mtklein, 2015-04-27 21:16:52]

Created Revert of De-proc Color32

[commit-bot: I haz the power, 2015-04-27 21:17:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1108163002/1

[commit-bot: I haz the power, 2015-04-27 21:17:42]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/498856ebc6f22d7018071bd6696756d7cd077ab8