Roll external/skia c0b32b335..c6611c0de (1 commits)

https://skia.googlesource.com/skia.git/+log/c0b32b335..c6611c0de

2019-06-03 jcgregorio@google.com Add 'modules' to doxygen generation.

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Change-Id: I63675efe061c5ac811f3086f7be5c2ed2f2378b6
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