Include <function> in TextureProxy.h
Include <function> in TextureProxy.h

Change-Id: I6427cd87dd3430d51032618af46afa7905e32f70
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/603416
Commit-Queue: Ben Wagner <53965154ffeecc4a10886eab9259e95965f2979a@google.com>
Reviewed-by: Robert Phillips <95e8ac5504948c7bf91b22c16a8dbb7ae7c66bfd@google.com>

google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia