Roll external/skia c4e5b04f9..95a34fe28 (1 commits)

https://skia.googlesource.com/skia.git/+log/c4e5b04f9..95a34fe28

2017-08-28 angle-deps-roller@chromium.org Roll skia/third_party/externals/angle2/ d7576737a..12e957f85 (2 commits)

Test: Presubmit checks will test this change.
Change-Id: Ia9cbe2bdf183b7961a7706d5ecca31e2f8a261b5