Roll external/skia cb218b30a..d0e0a8ff4 (1 commits)

https://skia.googlesource.com/skia.git/+log/cb218b30a..d0e0a8ff4

2017-06-05 vabr@chromium.org Don't move raw pointers in SkCanvas

Test: Presubmit checks will test this change.
Change-Id: I9c83942d2e0ff2664c1b207bcd963884e3e47a7d