Reland "Add option for clients to set default gpu staging buffer size."

This is a reland of commit 8641e7b97ef27a969173481abe43904a70a3d166

Original change's description:
> Add option for clients to set default gpu staging buffer size.
>
> Bug: b/298029730
> Change-Id: I4e94341b56e706cb6368642887d38cfc6fb558c2
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/752280
> Reviewed-by: Robert Phillips <robertphillips@google.com>
> Commit-Queue: Greg Daniel <egdaniel@google.com>

Bug: b/298029730
Change-Id: I04fe1fd2e66b27428a10f44563c431b318771c36
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/755457
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
3 files changed