Bug 1734016 - Annotate some re-enabled tests that fail with drawSnapshot for now. r=tnikkel DONTBUILD

Differential Revision: https://phabricator.services.mozilla.com/D127652

layout/reftests/backgrounds/reftest.list

@@ -88,7 +88,7 @@ fuzzy(0-1,0-1024) == translucent-color-3.html translucent-color-ref.html
 
 != background-size-body-percent-percent-overflow.html background-size-body-percent-percent-overflow-ref.html
 
-== background-size-zoom-no-repeat.html background-size-zoom-no-repeat-ref.html
+fails-if(useDrawSnapshot) == background-size-zoom-no-repeat.html background-size-zoom-no-repeat-ref.html # drawSnapshot doesn't deal with zoom properly.
 
 == background-size-contain-clip-padding.html background-size-contain-clip-padding-ref.html
 == background-size-contain-clip-border.html background-size-contain-clip-border-ref.html
@@ -120,12 +120,7 @@ random-if(OSX==1010) == background-size-monster-pt.html background-size-monster-
 random-if(OSX==1010) == background-size-monster-px.html background-size-monster-ref.html # bug 1129300
 random-if(OSX==1010) == background-size-monster-rem.html background-size-monster-ref.html # bug 1129300
 
-# There seems to be a pixel-snapping problem here, where the repeated background
+fails-if(useDrawSnapshot) == background-size-zoom-repeat.html background-size-zoom-repeat-ref.html # drawSnapshot doesn't deal with zoom properly.
-# image isn't being snapped at its boundaries.  Note that the boundaries within
-# the image aren't the issue, because they're being obscured to avoid sampling
-# algorithm dependencies (at least assuming the sampling algorithm in use
-# doesn't sample too far astray from the boundaries).
-== background-size-zoom-repeat.html background-size-zoom-repeat-ref.html # bug 1073209
 
 # -moz-default-background-color and -moz-default-color (bug 591341)
 == background-moz-default-background-color.html background-moz-default-background-color-ref.html
@@ -170,9 +165,9 @@ fuzzy(0-95,0-2206) == attachment-local-clipping-image-5.html attachment-local-cl
 fuzzy(0-109,0-908) fuzzy-if(geckoview&&device,64-64,2010-2830) == attachment-local-clipping-image-6.html attachment-local-clipping-image-6-ref.html
 
 fuzzy(0-1,0-84) == background-multiple-with-border-radius.html background-multiple-with-border-radius-ref.html
-fuzzy(0-11,0-49600) == background-repeat-large-area.html background-repeat-large-area-ref.html
+fuzzy(0-11,0-49600) fails-if(useDrawSnapshot) == background-repeat-large-area.html background-repeat-large-area-ref.html # bug 1734383
 
-fuzzy(0-31,0-474) == background-tiling-zoom-1.html background-tiling-zoom-1-ref.html
+fuzzy(0-31,0-474) fails-if(useDrawSnapshot) == background-tiling-zoom-1.html background-tiling-zoom-1-ref.html # drawSnapshot doesn't deal with zoom properly
 
 skip-if(!cocoaWidget) == background-repeat-resampling.html background-repeat-resampling-ref.html