Roll external/skia ddfd2a662..ba8275148 (5 commits)
https://skia.googlesource.com/skia.git/+log/ddfd2a662..ba8275148
2017-08-14 herb@google.com Add an average mode for sigma < 2
2017-08-14 skia-deps-roller@chromium.org Roll skia/third_party/externals/angle2/ 9b11ea4f2..d7487b135 (1 commit)
2017-08-14 benjaminwagner@google.com Upgrade NVIDIA drivers on Linux bots.
2017-08-14 bungeman@google.com Move lang to list in Android font manager.
2017-08-14 herb@google.com Test blur small radii and text.
Test: Presubmit checks will test this change.
Change-Id: Ia84524c22941c19c5e40c99839ad53d9fabeb4c1