fix for using too much memory in GrBatchAtlas

fix for using too much memory in GrBatchAtlas

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/e062db9cc6478745138cca964ee46839e413ab7b

[joshualitt, 2015-04-24 14:45:52]

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

[joshualitt, 2015-04-24 14:45:53]

ptal, this is the simple way to do this.  I could also reduce the number of
malloc by 1 by allocating plots on demand, and then placement newing them. 
Thoughts?

[bsalomon, 2015-04-24 15:07:41]

https://codereview.chromium.org/1105913002/diff/1/src/gpu/GrBatchAtlas.cpp
File src/gpu/GrBatchAtlas.cpp (right):

https://codereview.chromium.org/1105913002/diff/1/src/gpu/GrBatchAtlas.cpp#ne...
src/gpu/GrBatchAtlas.cpp:54: fData = reinterpret_cast<unsigned
char*>(sk_calloc_throw(fBytesPerPixel * fWidth * fHeight));
lgtm, wrap this and delete commented out lines?

[joshualitt, 2015-04-24 15:27:39]

The CQ bit was checked by joshualitt@google.com

[joshualitt, 2015-04-24 15:27:39]

The patchset sent to the CQ was uploaded after l-g-t-m from bsalomon@google.com
Link to the patchset: https://codereview.chromium.org/1105913002/#ps20001
(title: "feedback inc")

[commit-bot: I haz the power, 2015-04-24 15:27:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1105913002/20001

[commit-bot: I haz the power, 2015-04-24 15:33:26]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/e062db9cc6478745138cca964ee46839e413ab7b