Revert "Revert "Add antialiasing to SkDropShadowImageFilter's shadow draw""
Revert "Revert "Add antialiasing to SkDropShadowImageFilter's shadow draw""

This reverts commit 45aac57ac6195880930441656a0988453f16c3db.

Reason for revert:

Pixel test suppression has landed in Chrome:
https://codereview.chromium.org/2559213002 (Add suppression for GPU Pixel test in preparation for Skia CL)

Original change's description:
> Revert "Add antialiasing to SkDropShadowImageFilter's shadow draw"
> 
> This reverts commit 78e8165ec3a408a88c394095bfbc43df2051449d.
> 
> Reason for revert: Chrome pixel test
> 
> Original change's description:
> > Add antialiasing to SkDropShadowImageFilter's shadow draw
> > 
> > A BW draw in the SkDropShadowImageFilter can lead to unexpected popping of the shadow when the dest rect lies on half pixel boundaries.
> > 
> > Change-Id: Ibc59dacc79bca8955981ec2889e79facd7d2de83
> > Reviewed-on: https://skia-review.googlesource.com/5669
> > Reviewed-by: Brian Salomon <bsalomon@google.com>
> > Commit-Queue: Robert Phillips <95e8ac5504948c7bf91b22c16a8dbb7ae7c66bfd@google.com>
> > 
> 
> TBR=bsalomon@google.com,95e8ac5504948c7bf91b22c16a8dbb7ae7c66bfd@google.com
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> 
> Change-Id: I0b0073cd8d9f1502daaa452c2153af029c11e52a
> Reviewed-on: https://skia-review.googlesource.com/5652
> Commit-Queue: Robert Phillips <95e8ac5504948c7bf91b22c16a8dbb7ae7c66bfd@google.com>
> Reviewed-by: Robert Phillips <95e8ac5504948c7bf91b22c16a8dbb7ae7c66bfd@google.com>
> 

TBR=bsalomon@google.com,95e8ac5504948c7bf91b22c16a8dbb7ae7c66bfd@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: I7d844c486fd6db57d3df60a32c12699f2d85ad16
Reviewed-on: https://skia-review.googlesource.com/5747
Commit-Queue: Robert Phillips <95e8ac5504948c7bf91b22c16a8dbb7ae7c66bfd@google.com>
Reviewed-by: Robert Phillips <95e8ac5504948c7bf91b22c16a8dbb7ae7c66bfd@google.com>

Hikari-no-Tenshi/android_external_skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,Hikari-no-Tenshi/android_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,Hikari-no-Tenshi/android_external_skia,google/skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,rubenvb/skia,google/skia,aosp-mirror/platform_external_skia,rubenvb/skia,google/skia,google/skia,google/skia,aosp-mirror/platform_external_skia,rubenvb/skia,Hikari-no-Tenshi/android_external_skia,Hikari-no-Tenshi/android_external_skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,rubenvb/skia,HalCanary/skia-hc,rubenvb/skia,rubenvb/skia,rubenvb/skia,rubenvb/skia,google/skia,google/skia,rubenvb/skia,HalCanary/skia-hc,Hikari-no-Tenshi/android_external_skia,HalCanary/skia-hc,HalCanary/skia-hc,aosp-mirror/platform_external_skia,google/skia,rubenvb/skia,Hikari-no-Tenshi/android_external_skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,HalCanary/skia-hc,Hikari-no-Tenshi/android_external_skia,HalCanary/skia-hc