Revert "Revert "Hard code bicubic coefficients in the shader""

Revert "Revert "Hard code bicubic coefficients in the shader""

This reverts commit b38db9a48db09b233309dca4f0858c1f0976734d.

Reason for revert: Nevermind. The regression was actually a bug fix!

Original change's description:
> Revert "Hard code bicubic coefficients in the shader"
>
> This reverts commit 81ad5f744a775826c0d68bf035e891ae178f89d2.
>
> Reason for revert: Serious regressions on Tegra3, and significant regression on Adreno 530.
>
> Original change's description:
> > Hard code bicubic coefficients in the shader
> >
> > BUG=skia:
> >
> > Change-Id: Ie231a9bd2ea2083005a595e9e426590da740b2ed
> > Reviewed-on: https://skia-review.googlesource.com/6619
> > Reviewed-by: Robert Phillips <robertphillips@google.com>
> > Commit-Queue: Brian Osman <brianosman@google.com>
> >
>
> TBR=bsalomon@google.com,robertphillips@google.com,brianosman@google.com,reviews@skia.org
> BUG=skia:
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
>
> Change-Id: I62b26f2a67e8a245c36bb6098c5cb9fbed21bb8f
> Reviewed-on: https://skia-review.googlesource.com/6630
> Commit-Queue: Brian Osman <brianosman@google.com>
> Reviewed-by: Brian Osman <brianosman@google.com>
>

TBR=bsalomon@google.com,robertphillips@google.com,reviews@skia.org,brianosman@google.com
BUG=skia:
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: I5d6d59f7079aca53b60472e1add75b319068fa67
Reviewed-on: https://skia-review.googlesource.com/6682
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>