re-add samplerstress gm, but use blurmaskfilter instead (std filter)

re-add samplerstress gm, but use blurmaskfilter instead (std filter)

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/d7127e7b835b4c5d4767ee9d8794e9865c81f1ac

[reed1, 2014-08-12 13:27:04]

The CQ bit was checked by reed@google.com

[commit-bot: I haz the power, 2014-08-12 13:27:18]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/reed@google.com/468483002/1

[commit-bot: I haz the power, 2014-08-12 13:27:19]

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 a valid reviewer till 2014-08-12 19:27 UTC

[robertphillips, 2014-08-12 13:52:46]

lgtm + comment correction

https://codereview.chromium.org/468483002/diff/1/gm/samplerstress.cpp
File gm/samplerstress.cpp (right):

https://codereview.chromium.org/468483002/diff/1/gm/samplerstress.cpp#newcode101
gm/samplerstress.cpp:101: // draw a letter "M" with a green & red striped
texture and a
blur

[commit-bot: I haz the power, 2014-08-12 13:53:13]

Change committed as d7127e7b835b4c5d4767ee9d8794e9865c81f1ac