Do `gclient sync` before compile

Bug: skia:7388
Change-Id: I8d68fe754ceeedea8ca7ff53ad9d2bb18a328288
Reviewed-on: https://skia-review.googlesource.com/90241
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Yuqian Li <liyuqian@google.com>
1 file changed