Add 4f linear gradient benches

Add 4f linear gradient benches

Plus some more regular tiling mode variations and random cleanups.

R=reed@google.com,mtklein@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1728283003

Committed: https://skia.googlesource.com/skia/+/36693b5ac850257483643586d6cdb83defa90d9c

[f(malita), 2016-02-24 20:20:05]

Description was changed from

==========
Add 4f linear gradient benches

Plus some more regular tiling mode variations and random cleanups.

R=reed@google.com,mtklein@google.com
==========

to

==========
Add 4f linear gradient benches

Plus some more regular tiling mode variations and random cleanups.

R=reed@google.com,mtklein@google.com
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

[f(malita), 2016-02-24 20:31:41]

Current numbers (nanobench -m gradient_linear --config 8888 --samples 1000 -q):

    198.61  	gradient_linear_mirror
     86.38  	gradient_linear_mirror_4f
    198.49  	gradient_linear_mirror_3color
     92.04  	gradient_linear_mirror_3color_4f
    198.85  	gradient_linear_mirror_hicolor
    153.81 ?	gradient_linear_mirror_hicolor_4f

    122.86 !	gradient_linear_repeat
     86.47  	gradient_linear_repeat_4f
    122.86 ?	gradient_linear_repeat_3color
     92.53  	gradient_linear_repeat_3color_4f
    122.64  	gradient_linear_repeat_hicolor
    153.08  	gradient_linear_repeat_hicolor_4f

     87.74  	gradient_linear_clamp
     85.30  	gradient_linear_clamp_4f
     95.09  	gradient_linear_clamp_3color
     90.92 ?	gradient_linear_clamp_3color_4f
    176.68  	gradient_linear_clamp_hicolor
    156.25 !	gradient_linear_clamp_hicolor_4f

- new impl is generally faster (much faster for mirror & repeat with few stops)
- new impl has higher per-stop overhead for mirror & repeat when compared to
legacy impl => it gets relatively slower as the number of stops increases

[f(malita), 2016-02-24 20:32:07]

The CQ bit was checked by fmalita@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-02-24 20:33:14]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1728283003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1728283003/1

[commit-bot: I haz the power, 2016-02-24 20:44:17]

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

[commit-bot: I haz the power, 2016-02-24 20:44:18]

Dry run: This issue passed the CQ dry run.

[f(malita), 2016-02-24 22:22:32]

The CQ bit was checked by fmalita@chromium.org

[commit-bot: I haz the power, 2016-02-24 22:22:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1728283003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1728283003/1

[commit-bot: I haz the power, 2016-02-24 22:22:37]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from valid reviewer(s) till 2016-02-25 04:22 UTC

[mtklein, 2016-02-24 23:32:08]

lgtm

[commit-bot: I haz the power, 2016-02-24 23:33:00]

Description was changed from

==========
Add 4f linear gradient benches

Plus some more regular tiling mode variations and random cleanups.

R=reed@google.com,mtklein@google.com
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

to

==========
Add 4f linear gradient benches

Plus some more regular tiling mode variations and random cleanups.

R=reed@google.com,mtklein@google.com
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...

Committed:
https://skia.googlesource.com/skia/+/36693b5ac850257483643586d6cdb83defa90d9c
==========

[commit-bot: I haz the power, 2016-02-24 23:33:01]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/36693b5ac850257483643586d6cdb83defa90d9c

[mtklein, 2016-02-24 23:33:38]

(I will happily serve as TBR= target for CLs like this if waiting for a review
even vaguely inconveniences you.)

[f(malita), 2016-02-25 00:19:09]

On 2016/02/24 23:33:38, mtklein wrote:
> (I will happily serve as TBR= target for CLs like this if waiting for a review
> even vaguely inconveniences you.)

Thanks, I would totally cowboy-land if in a hurry.

Exhibit A: TBR, NOTRY and all bots red
https://codereview.chromium.org/1733833002 (just don't let any chromium sheriff
see that :)