Revert of remove colorfilter native-565 support. complicating w/ no real value.

Revert of remove colorfilter native-565 support. complicating w/ no real value. (patchset #2 id:20001 of https://codereview.chromium.org/1015533011/)

Reason for revert:
skia/ext/benchmarking_canvas.cc references HasFilter16 :(

Original issue's description:
> remove colorfilter native-565 support. complicating w/ no real value.
> 
> BUG=skia:
> TBR=
> 
> Committed: https://skia.googlesource.com/skia/+/2151353d161fe389cdc0db62cfe1932c7680f710

TBR=reed@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed: https://skia.googlesource.com/skia/+/92b47c49016749249ff8521e424c4373b4a74241

[reed1, 2015-03-24 12:17:50]

Created Revert of remove colorfilter native-565 support. complicating w/ no real
value.

[commit-bot: I haz the power, 2015-03-24 12:18:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1022673007/1

[commit-bot: I haz the power, 2015-03-24 12:18:14]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/92b47c49016749249ff8521e424c4373b4a74241

[reed1, 2015-03-24 13:35:01]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1016103004/ by reed@google.com.

The reason for reverting is: fix for chrome has landed....