Roll external/skia 880768032..a1d1703b7 (5 commits)
https://skia.googlesource.com/skia.git/+log/880768032..a1d1703b7
2017-08-11 mtklein@chromium.org double pump 8-bit stages
2017-08-11 benjaminwagner@google.com Upgrade Intel HD4600 and Iris6100 drivers.
2017-08-11 bungeman@google.com Revert "Remove subpixel positioning implies no bytecode hinting."
2017-08-11 skia-deps-roller@chromium.org Roll skia/third_party/externals/angle2/ c2157a09d..936ea3250 (1 commit)
2017-08-11 mtklein@chromium.org ok, add a bench source
Test: Presubmit checks will test this change.
Change-Id: I0bc0d2bcdba1df3fa2f080692f36b6a2e477d8cc