adding rect batch unit test

adding rect batch unit test

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/a2532d90cf3d71286276a6659db035c51b789658

[joshualitt, 2015-05-07 15:49:09]

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

[joshualitt, 2015-05-07 15:49:10]

ptal

[robertphillips, 2015-05-07 16:33:21]

lgtm + suggestions

https://codereview.chromium.org/1135513002/diff/1/src/gpu/GrRectBatch.cpp
File src/gpu/GrRectBatch.cpp (right):

https://codereview.chromium.org/1135513002/diff/1/src/gpu/GrRectBatch.cpp#new...
src/gpu/GrRectBatch.cpp:260: 
Don't bother initing viewMatrix and/or localMatrix here ?
Move both decls down closer to where they are used ?

[joshualitt, 2015-05-07 21:14:13]

The CQ bit was checked by joshualitt@google.com

[joshualitt, 2015-05-07 21:14:13]

The patchset sent to the CQ was uploaded after l-g-t-m from
robertphillips@google.com
Link to the patchset: https://codereview.chromium.org/1135513002/#ps20001
(title: "tidy")

[commit-bot: I haz the power, 2015-05-07 21:14:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1135513002/20001

[commit-bot: I haz the power, 2015-05-07 21:21:06]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/a2532d90cf3d71286276a6659db035c51b789658