ResourceProviderProxyBase should forward loadAudioAsset()

ResourceProviderProxyBase is supposed to forward all virtuals to fProxy,
but it currently drops loadAudioAsset().

TBR=
Change-Id: I8c690802cd3ba6078232e210b032aa67499d7ba8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/368116
Auto-Submit: Florin Malita <fmalita@chromium.org>
Reviewed-by: Florin Malita <fmalita@google.com>
Commit-Queue: Florin Malita <fmalita@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
2 files changed