[css-pseudo] Allow 'white-space' in ::marker

The spec has added 'white-space' to the list of properties that apply to
::marker pseudo-elements.

Spec: https://drafts.csswg.org/css-pseudo-4/#marker-pseudo

BUG=457718

TEST=external/wpt/css/css-pseudo/parsing/marker-supported-properties.html

Change-Id: Iaf05bb568d0127b2aae4219715bb8839620101a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1954384Reviewed-by: Koji Ishii <kojii@chromium.org>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Commit-Queue: Oriol Brufau <obrufau@igalia.com>
Cr-Commit-Position: refs/heads/master@{#722420}

third_party/blink/renderer/core/css/resolver/style_resolver.cc

@@ -1536,6 +1536,7 @@ static inline bool IsValidMarkerStyleProperty(CSSPropertyID id) {
     case CSSPropertyID::kFontWeight:
     case CSSPropertyID::kTextCombineUpright:
     case CSSPropertyID::kUnicodeBidi:
+    case CSSPropertyID::kWhiteSpace:
       return true;
 
     // Not directly specified in spec, but variables should be supported nearly

third_party/blink/web_tests/external/wpt/css/css-pseudo/parsing/marker-supported-properties-expected.txt

@@ -15,6 +15,7 @@ PASS Property font-variant-ligatures value 'historical-ligatures' computes to 'h
 PASS Property font-variant-numeric value 'slashed-zero' computes to 'slashed-zero' in ::marker
 FAIL Property font-variant-position value 'sub' computes to 'sub' in ::marker assert_true: font-variant-position doesn't seem to be supported in the computed style expected true got false
 PASS Property font-weight value '900' computes to '900' in ::marker
+PASS Property white-space value 'nowrap' computes to 'nowrap' in ::marker
 PASS Property color value 'rgb(0, 100, 200)' computes to 'rgb(0, 100, 200)' in ::marker
 PASS Property text-combine-upright value 'all' computes to 'all' in ::marker
 PASS Property unicode-bidi value 'plaintext' computes to 'plaintext' in ::marker

third_party/blink/web_tests/external/wpt/css/css-pseudo/parsing/marker-supported-properties.html

@@ -31,6 +31,9 @@ test_pseudo_computed_value("::marker", "font-variant-numeric", "slashed-zero");
 test_pseudo_computed_value("::marker", "font-variant-position", "sub");
 test_pseudo_computed_value("::marker", "font-weight", "900");
 
+// ::marker supports `white-space`
+test_pseudo_computed_value("::marker", "white-space", "nowrap");
+
 // ::marker supports `color`
 test_pseudo_computed_value("::marker", "color", "rgb(0, 100, 200)");