Reland of Add fast normalize for SkLightingImageFilter.

Reland of Add fast normalize for SkLightingImageFilter. (patchset #1 id:1 of https://codereview.chromium.org/1244523002/)

Reason for revert:
Florin will rebaseline the images.

Original issue's description:
> Revert of Add fast normalize for SkLightingImageFilter. (patchset #2 id:20001 of https://codereview.chromium.org/1240023002/)
> 
> Reason for revert:
> Speculative revert -- DEPS roll block on linux_blink_rel
> 
> https://storage.googleapis.com/chromium-layout-test-archives/linux_blink_rel/71483/layout-test-results/results.html
> 
> Original issue's description:
> > Add fast normalize for SkLightingImageFilter.
> > 
> > The normalize routine in SkPoint3 is very robust. However, for simple
> > lighting cases we prefer speed over robustness. This fixes a perf
> > regression in smoothness.tough_filters_cases.
> > 
> > BUG=chromium:510562
> > 
> > Committed: https://skia.googlesource.com/skia/+/dfa0ecf169db87f7afddd93bc1c500de481a62c7
> 
> TBR=reed@google.com,senorblanco@google.com,senorblanco@chromium.org,jvanverth@google.com
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=chromium:510562
> 
> Committed: https://skia.googlesource.com/skia/+/ac66a8122b27c388cc74b3913d9a9be351a44e54

TBR=reed@google.com,senorblanco@google.com,senorblanco@chromium.org,reed@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:510562
Committed: https://skia.googlesource.com/skia/+/992c7612394a26e36ba355f6d8d3801d8d8f1260

[jvanverth1, 2015-07-17 14:22:18]

Created Reland of Add fast normalize for SkLightingImageFilter.

[commit-bot: I haz the power, 2015-07-17 14:22:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1241583007/1

[commit-bot: I haz the power, 2015-07-17 14:22:32]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/992c7612394a26e36ba355f6d8d3801d8d8f1260