Revert "reduce SkDisplacementImageFilter size"

This reverts commit ed68a92ca65762f0d0c4060668ceeb9c92506cf9.

Reason for revert: breaks layouttests (on BGRA?)

Original change's description:
> reduce SkDisplacementImageFilter size
> 
> saves ~8K on mac laptop
> 
> - remove templates
> - check for 0 0r 0xFF in alpha
> 
> Before: (using modified bench w/o caching)
> 
>   23/23  MB	2	134µs	151µs	146µs	156µs	6%	█▇▆▆▆▆▄▁▁▁	8888	displacement_full_large
>   23/23  MB	2	253µs	254µs	255µs	260µs	1%	█▄▄▅▂▁▂▁▁▁	8888	displacement_alpha_large
>   24/24  MB	1	410µs	410µs	415µs	445µs	3%	█▃▁▂▁▁▁▁▁▁	8888	displacement_zero_large
>   24/24  MB	151	840ns	841ns	853ns	938ns	4%	█▁▁▁▁▁▁▂▁▁	8888	displacement_full_small
>   24/24  MB	180	832ns	835ns	836ns	851ns	1%	█▂▁▂▂▁▂▂▂▂	8888	displacement_alpha_small
>   24/24  MB	9	60µs	60.9µs	69.9µs	101µs	19%	█▄▄▄▁▁▁▁▁▁	8888	displacement_zero_small
> 
> After:
> 
>   23/23  MB	3	47.4µs	48µs	48.2µs	51.4µs	2%	█▂▂▃▃▁▁▁▂▁	8888	displacement_full_large
>   23/23  MB	2	140µs	141µs	145µs	166µs	7%	▂▁▁▁▁▁▁▁▇█	8888	displacement_alpha_large
>   24/24  MB	2	189µs	196µs	197µs	225µs	5%	█▃▂▂▂▂▃▂▁▁	8888	displacement_zero_large
>   24/24  MB	134	588ns	594ns	597ns	616ns	1%	▂▁▁█▂▆▂▂▃▄	8888	displacement_full_small
>   24/24  MB	168	590ns	592ns	592ns	599ns	0%	▃▂▁▁▁▁▁█▂▂	8888	displacement_alpha_small
>   24/24  MB	9	8.39µs	8.41µs	8.42µs	8.53µs	0%	█▄▃▂▁▁▃▂▁▂	8888	displacement_zero_small
> 
> Bug: skia:
> Change-Id: Ia3b12dc8420b32b65633bb1cf76a15241e420eac
> Reviewed-on: https://skia-review.googlesource.com/20181
> Reviewed-by: Mike Klein <mtklein@google.com>
> Commit-Queue: Mike Reed <reed@google.com>

TBR=mtklein@google.com,robertphillips@google.com,fmalita@chromium.org,reed@google.com

Change-Id: I811c5f25a328c75527ce5caa0d9b8e123d535583
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/20182
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed