Revert of Make A8 readback work in more cases and improve testing.

Revert of Make A8 readback work in more cases and improve testing. (patchset #5 id:70001 of https://codereview.chromium.org/1584563002/ )

Reason for revert:
Breaking video tests in Chrome.

Original issue's description:
> Make A8 readback work in more cases and improve testing.
> 
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1584563002
> 
> Committed: https://skia.googlesource.com/skia/+/b76afedf11c7fe933954d030048c3222860249e1

TBR=egdaniel@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed: https://skia.googlesource.com/skia/+/23e566664b85472766c921cd2f5615c846919934

[bsalomon, 2016-01-14 15:19:30]

Created Revert of Make A8 readback work in more cases and improve testing.

[commit-bot: I haz the power, 2016-01-14 15:19:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1581203005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1581203005/1

[commit-bot: I haz the power, 2016-01-14 15:19:50]

Description was changed from

==========
Revert of Make A8 readback work in more cases and improve testing. (patchset #5
id:70001 of https://codereview.chromium.org/1584563002/ )

Reason for revert:
Breaking video tests in Chrome.

Original issue's description:
> Make A8 readback work in more cases and improve testing.
> 
> BUG=skia:
> GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
> 
> Committed:
https://skia.googlesource.com/skia/+/b76afedf11c7fe933954d030048c3222860249e1

TBR=egdaniel@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:
==========

to

==========
Revert of Make A8 readback work in more cases and improve testing. (patchset #5
id:70001 of https://codereview.chromium.org/1584563002/ )

Reason for revert:
Breaking video tests in Chrome.

Original issue's description:
> Make A8 readback work in more cases and improve testing.
> 
> BUG=skia:
> GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
> 
> Committed:
https://skia.googlesource.com/skia/+/b76afedf11c7fe933954d030048c3222860249e1

TBR=egdaniel@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed:
https://skia.googlesource.com/skia/+/23e566664b85472766c921cd2f5615c846919934
==========

[commit-bot: I haz the power, 2016-01-14 15:19:51]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/23e566664b85472766c921cd2f5615c846919934