Don't flush on read/write pixels unless necessary

Don't flush on read/write pixels unless necessary

BUG=skia:2889
Committed: https://skia.googlesource.com/skia/+/150723b9298772a5096bec7acd2999c5c9d66239

Committed: https://skia.googlesource.com/skia/+/8d034a154fec81167ecb696c07da389b98cc02a7

[bsalomon, 2014-09-22 14:41:22]

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

[bsalomon, 2014-09-22 14:41:22]

https://codereview.chromium.org/586073002/diff/20001/include/gpu/GrGpuResource.h
File include/gpu/GrGpuResource.h (right):

https://codereview.chromium.org/586073002/diff/20001/include/gpu/GrGpuResourc...
include/gpu/GrGpuResource.h:83: 
will remove this extra \n

[robertphillips, 2014-09-22 14:48:03]

lgtm

[bsalomon, 2014-09-22 14:55:09]

The CQ bit was checked by bsalomon@google.com

[commit-bot: I haz the power, 2014-09-22 14:55:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/586073002/20001

[commit-bot: I haz the power, 2014-09-22 15:17:05]

Committed patchset #2 (id:20001) as 150723b9298772a5096bec7acd2999c5c9d66239

[bsalomon, 2014-09-22 16:11:39]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/594543004/ by bsalomon@google.com.

The reason for reverting is: Breaking the tree.

[bsalomon, 2014-09-22 19:06:28]

The CQ bit was checked by bsalomon@google.com

[commit-bot: I haz the power, 2014-09-22 19:07:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/586073002/40001

[commit-bot: I haz the power, 2014-09-22 19:21:14]

Committed patchset #3 (id:40001) as 8d034a154fec81167ecb696c07da389b98cc02a7