Convert readSurfacePixels to use a draw context instead of a texture

Convert readSurfacePixels to use a draw context instead of a texture
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2165523003

Committed: https://skia.googlesource.com/skia/+/b117ff194ff888ef9107a4797aad053b0d76be30

[bsalomon, 2016-07-19 13:44:01]

Description was changed from

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Convert readSurfacePixels to use a draw context instead of a texture
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to

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Convert readSurfacePixels to use a draw context instead of a texture
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2165523003
==========

[bsalomon, 2016-07-19 13:51:40]

bsalomon@google.com changed reviewers:
+ brianosman@google.com, robertphillips@google.com

[bsalomon, 2016-07-19 13:51:41]

This is motivated by removing instances where we create a DC from a RT rather
than starting from a DC.

[Brian Osman, 2016-07-19 13:58:47]

lgtm

[bsalomon, 2016-07-19 14:08:42]

The CQ bit was checked by bsalomon@google.com

[commit-bot: I haz the power, 2016-07-19 14:08:45]

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

[robertphillips, 2016-07-19 14:10:49]

lgtm

[commit-bot: I haz the power, 2016-07-19 14:24:44]

Description was changed from

==========
Convert readSurfacePixels to use a draw context instead of a texture
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2165523003
==========

to

==========
Convert readSurfacePixels to use a draw context instead of a texture
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2165523003

Committed:
https://skia.googlesource.com/skia/+/b117ff194ff888ef9107a4797aad053b0d76be30
==========

[commit-bot: I haz the power, 2016-07-19 14:24:45]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/b117ff194ff888ef9107a4797aad053b0d76be30