Revert of Don't readback and reupload texture-backed bitmaps (patchset #1 id:1 of https://codereview.chromium.org/635573004/)

Reason for revert:
This fails on some Android devices, missing part of tileimagefilter GM which were previously triggering the readback/upload code path.

Original issue's description:
> Don't readback and reupload texture-backed bitmaps
>
> Committed: https://skia.googlesource.com/skia/+/b9ab5631703c258f1aae7a3ca1bb4b6596b5b42c

TBR=robertphillips@google.com
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/632293002
1 file changed