Roll src/third_party/skia/ 7e5e594ea..64b92a592 (5 commits).

Roll src/third_party/skia/ 7e5e594ea..64b92a592 (5 commits).

https://chromium.googlesource.com/skia.git/+log/7e5e594ea6fe..64b92a59294a

$ git log 7e5e594ea..64b92a592 --date=short --no-merges --format='%ad %ae %s'
2016-06-21 csmartdalton Support GL_SAMPLES queries in null contexts
2016-06-21 scroggo Bring back compiling third_party/libpng in public.bzl
2016-06-21 cblume Store mipmap levels in deferred texture image
2016-06-21 brianosman Add new GM that exercises Gray 8 mipmapping and sRGB-ness
2016-06-21 stani Remove check for cmake in android make script. Update docs explaining how to setup Android SDK.

BUG=578304
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
TBR=brianosman@google.com

[skia-deps-roller, 2016-06-22 11:07:56]

The CQ bit was checked by skia-deps-roller@chromium.org

[commit-bot: I haz the power, 2016-06-22 11:08:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2085243002/1

[commit-bot: I haz the power, 2016-06-22 11:47:53]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-06-22 11:47:54]

Try jobs failed on following builders:
  linux_android_rel_ng on tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/linux_androi...)

[skia-deps-roller, 2016-06-22 11:48:25]

Commit queue failed; closing this roll.