By default purge resources that haven't been used for 64 flushes
By default purge resources that haven't been used for 64 flushes

BUG=skia:4258

Committed: https://skia.googlesource.com/skia/+/85047175508a24f43eef49359bed215a2a3bb104

R=robertphillips@google.com

Committed: https://skia.googlesource.com/skia/+/71d0c33068d41878cc3117f3761f49300f6b3d54

Committed: https://skia.googlesource.com/skia/+/bd783cd5b62118277b75933c3cd7b9097129259a

Review URL: https://codereview.chromium.org/1316233003

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