remove randomness in dstreadshuffle

remove randomness in dstreadshuffle

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/ddb714b09a5f84e870dfc650b6da4197fd36d9c2

[joshualitt, 2015-04-15 14:36:02]

joshualitt@google.com changed reviewers:
+ egdaniel@google.com

[joshualitt, 2015-04-15 14:36:08]

joshualitt@google.com changed reviewers:
+ joshualitt@google.com

[joshualitt, 2015-04-15 14:36:09]

ptal

[joshualitt, 2015-04-15 14:36:13]

The CQ bit was checked by joshualitt@google.com

[commit-bot: I haz the power, 2015-04-15 14:36:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1085443005/1

[commit-bot: I haz the power, 2015-04-15 14:36:29]

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 2015-04-15 20:36 UTC

[egdaniel, 2015-04-15 15:00:00]

lgtm

[joshualitt, 2015-04-15 15:00:15]

The CQ bit was checked by joshualitt@google.com

[commit-bot: I haz the power, 2015-04-15 15:00:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1085443005/40001

[commit-bot: I haz the power, 2015-04-15 15:08:33]

Committed patchset #3 (id:40001) as
https://skia.googlesource.com/skia/+/ddb714b09a5f84e870dfc650b6da4197fd36d9c2