Revert of Revert[2] of add ImageShader, sharing code with its Bitmap cousin (patchset #11 id:200001 of https://codereview.chromium.org/1352293002/ )

Reason for revert:
guess: Need to handle NPOT support in shader case

Original issue's description:
> Revert[2] of add ImageShader, sharing code with its Bitmap cousin
>
> Adjustment from previous land : runtime check for npot-support when texture is requested for tiling.
>
> (patchset #10 id:180001 of https://codereview.chromium.org/1342113002/ )
>
> This reverts commit f2608513626264459a00388537175600b515cae2.
>
> BUG=skia:4365
>
> Committed: https://skia.googlesource.com/skia/+/fe05707c356d2a8c2c69222591d4cafbd456b4e5

TBR=fmalita@chromium.org,robertphillips@google.com,bsalomon@google.com,reed@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:4365

Review URL: https://codereview.chromium.org/1375673002
9 files changed