Add clang_win asset

Bug: skia:2679
Change-Id: I7abffae32102a69271b23834a121c51426813e27
Reviewed-on: https://skia-review.googlesource.com/28785
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
6 files changed