Keep valgrind happen by purging caches.

Change-Id: Ic387edb9b5d71110c10c8a40a362ed2853d140f5
Reviewed-on: https://skia-review.googlesource.com/7638
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Herb Derby <herb@google.com>
2 files changed