Remove caching from the draw-atlas GMs. Fixes bugs cycling backends.

Remove caching from the draw-atlas GMs. Fixes bugs cycling backends.

When we would change backend or color type in SampleApp, we'd be rendering
from a no-longer-valid image, leading to missing output, etc...

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2381893004

Committed: https://skia.googlesource.com/skia/+/95e8d0a4ae3c755fd9ffbd0c276fc657999fecee

[Brian Osman, 2016-09-29 20:23:42]

Description was changed from

==========
Remove caching from the draw-atlas GMs. Fixes bugs cycling backends.

When we would change backend or color type in SampleApp, we'd be rendering
from a no-longer-valid image, leading to missing output, etc...

BUG=skia:
==========

to

==========
Remove caching from the draw-atlas GMs. Fixes bugs cycling backends.

When we would change backend or color type in SampleApp, we'd be rendering
from a no-longer-valid image, leading to missing output, etc...

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2381893004
==========

[Brian Osman, 2016-09-29 20:24:29]

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

[mtklein_C, 2016-09-29 20:26:17]

The CQ bit was checked by mtklein@chromium.org

[mtklein_C, 2016-09-29 20:26:17]

lgtm

[commit-bot: I haz the power, 2016-09-29 20:26:19]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-29 20:43:50]

Description was changed from

==========
Remove caching from the draw-atlas GMs. Fixes bugs cycling backends.

When we would change backend or color type in SampleApp, we'd be rendering
from a no-longer-valid image, leading to missing output, etc...

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2381893004
==========

to

==========
Remove caching from the draw-atlas GMs. Fixes bugs cycling backends.

When we would change backend or color type in SampleApp, we'd be rendering
from a no-longer-valid image, leading to missing output, etc...

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2381893004

Committed:
https://skia.googlesource.com/skia/+/95e8d0a4ae3c755fd9ffbd0c276fc657999fecee
==========

[commit-bot: I haz the power, 2016-09-29 20:43:51]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/95e8d0a4ae3c755fd9ffbd0c276fc657999fecee