Remove (most) usage of MakeTextureFromPixmap

Planning to remove this API entirely, as it's not really needed. There is
one remaining call-site that requires a bigger change, so I want to land
these first.

BUG=skia:

Change-Id: I6c6ae88202291c4896c1ba8f47824596ac8a150f
Reviewed-on: https://skia-review.googlesource.com/7105
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
3 files changed