Roll external/skia fd98c2c87..722efde79 (4 commits)

https://skia.googlesource.com/skia.git/+log/fd98c2c87..722efde79

2018-08-01 benjaminwagner@google.com [Bazel] Add lottie as dm source.
2018-08-01 egdaniel@google.com Move GrVkInterface out of public API.
2018-08-01 nigeltao@google.com Have CodecTest's check not skip 'complete' tests
2018-08-01 nigeltao@google.com Avoid infinite loop in Codec_requiredFrame test

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Change-Id: I69e0bc8b2469a53ce8e99c752532bb6dcd36e6a4
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