[Gardening]: rdar://115757960 ([ Sonoma wk2 ] 13 hidpi tests are cons…

…istent images failures)

rdar://115757960

Unreviewed test gardening.

Add test expectations.

* LayoutTests/platform/mac-wk2/TestExpectations:

Canonical link: https://commits.webkit.org/268224@main

LayoutTests/platform/mac-wk2/TestExpectations

@@ -2149,7 +2149,7 @@ webkit.org/b/261344 requestidlecallback/requestidlecallback-does-not-block-timer
 [ Sonoma+ ] scrollingcoordinator/non-fast-scrollable-region-scaled-iframe.html [ Skip ]
 [ Sonoma+ ] scrollingcoordinator/non-fast-scrollable-region-transformed-iframe.html [ Skip ]
 
-# rdar://115757960 ([ Sonoma wk2 ] 8 compositing/hidpi tests are consistent images failures)
+# rdar://115757960 ([ Sonoma wk2 ] 13 hidpi tests are consistent images failures)
 [ Sonoma+ ] compositing/hidpi-ancestor-subpixel-clipping.html [ ImageOnlyFailure ]
 [ Sonoma+ ] compositing/hidpi-box-positioned-off-by-one-when-non-compositing-transform-is-present.html [ ImageOnlyFailure ]
 [ Sonoma+ ] compositing/hidpi-composited-container-and-graphics-layer-gap-changes.html [ ImageOnlyFailure ]
@@ -2158,3 +2158,8 @@ webkit.org/b/261344 requestidlecallback/requestidlecallback-does-not-block-timer
 [ Sonoma+ ] compositing/hidpi-simple-container-layer-on-device-pixel.html [ ImageOnlyFailure ]
 [ Sonoma+ ] compositing/hidpi-transform-with-render-layer-on-fractional-pixel-value.html [ ImageOnlyFailure ]
 [ Sonoma+ ] compositing/hidpi-viewport-clipping-on-composited-content.html [ ImageOnlyFailure ]
+[ Sonoma+ ] fast/backgrounds/hidpi-bitmap-background-origin-on-subpixel-position.html [ ImageOnlyFailure ]
+[ Sonoma+ ] fast/backgrounds/hidpi-bitmap-background-repeat-on-subpixel-position.html [ ImageOnlyFailure ]
+[ Sonoma+ ] fast/backgrounds/hidpi-generated-gradient-background-on-subpixel-position.html [ ImageOnlyFailure ]
+[ Sonoma+ ] fast/borders/hidpi-rounded-border-on-subpixel-position.html [ ImageOnlyFailure ]
+[ Sonoma+ ] fast/forms/hidpi-textarea-on-subpixel-position.html [ ImageOnlyFailure ]