use Sk4f for matrix math

use Sk4f for matrix math


Need to land SK_SUPPORT_LEGACY_SCALAR_MAPPOINTS in chrome to suppress Affine
version which causes slight differences (which will need to be rebaselined)

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/7da19014fda527a52381d85cc50b951031fa4754

[reed2, 2015-03-28 02:01:43]

The CQ bit was checked by reed@chromium.org

[commit-bot: I haz the power, 2015-03-28 02:01:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1045493002/1

[commit-bot: I haz the power, 2015-03-28 02:01:57]

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 2015-03-28 08:01 UTC

[reed2, 2015-03-28 02:02:58]

reed@chromium.org changed reviewers:
+ fmalita@chromium.org, mtklein@google.com

[reed2, 2015-03-28 02:02:58]

SK_SUPPORT_LEGACY_SCALAR_MAPPOINTS needed in chrome (or Affine_vpts will cause
slight image diffs). Those diffs should be fine, and will appear in Gold if/when
this lands in skia.

[reed2, 2015-03-28 02:03:01]

The CQ bit was unchecked by reed@chromium.org

[mtklein, 2015-03-28 03:05:18]

lgtm

[reed2, 2015-03-29 18:51:08]

The CQ bit was checked by reed@chromium.org

[commit-bot: I haz the power, 2015-03-29 18:51:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1045493002/1

[reed2, 2015-03-29 18:51:59]

The CQ bit was unchecked by reed@chromium.org

[reed2, 2015-03-29 18:52:25]

The CQ bit was checked by reed@chromium.org

[commit-bot: I haz the power, 2015-03-29 18:52:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1045493002/1

[commit-bot: I haz the power, 2015-03-29 18:58:52]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/7da19014fda527a52381d85cc50b951031fa4754