Revert of Move npot resizing out of GrContext and simplify GrContext texture function...

Revert of Move npot resizing out of GrContext and simplify GrContext texture functions. (patchset #10 id:200001 of https://codereview.chromium.org/882223003/)

Reason for revert:
perf fix didn't fix the cr webgl conformance tests

Original issue's description:
> Move npot resizing out of GrContext and simplify GrContext texture functions.
>
> Committed: https://skia.googlesource.com/skia/+/8a8100349105c8c6de39fcb34e47679da7a67f54
>
> Committed: https://skia.googlesource.com/skia/+/6c96672491b04cb782bce8fee778124df66524a0

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

Review URL: https://codereview.chromium.org/887303002