CSS Properties & Values API: Compute initial values for transfrom-list type.

third_party/WebKit/LayoutTests/custom-properties/registered-property-initial.html

Index: third_party/WebKit/LayoutTests/custom-properties/registered-property-initial.html
diff --git a/third_party/WebKit/LayoutTests/custom-properties/registered-property-initial.html b/third_party/WebKit/LayoutTests/custom-properties/registered-property-initial.html
index 91dcd4bb614c33479cc374441514f42de8a6ecda..dfc338aa6e26979d15c4e1e73a8c991716bfd5d5 100644
--- a/third_party/WebKit/LayoutTests/custom-properties/registered-property-initial.html
+++ b/third_party/WebKit/LayoutTests/custom-properties/registered-property-initial.html
@@ -13,6 +13,8 @@ CSS.registerProperty({name: '--length', syntax: '<length>', initialValue: 'calc(
 CSS.registerProperty({name: '--length-percentage', syntax: '<length-percentage>', initialValue: 'calc(1in + 10% + 4px)'});
 CSS.registerProperty({name: '--inherited-color', syntax: '<color>', initialValue: 'pink', inherits: true});
 CSS.registerProperty({name: '--non-inherited-color', syntax: '<color>', initialValue: 'purple'});
+CSS.registerProperty({name: '--single-transform-list', syntax: '<transform-list>', initialValue: 'scale(calc(2 + 2))'});
+CSS.registerProperty({name: '--multiple-transform-list', syntax: '<transform-list>', initialValue: 'scale(calc(2 + 1)) translateX(calc(3px + 1px))'});
 
 test(function() {
     computedStyle = getComputedStyle(target);
@@ -20,6 +22,8 @@ test(function() {
     assert_equals(computedStyle.getPropertyValue('--length-percentage'), 'calc(100px + 10%)');
     assert_equals(computedStyle.getPropertyValue('--inherited-color'), 'pink');
     assert_equals(computedStyle.getPropertyValue('--non-inherited-color'), 'purple');
+    assert_equals(computedStyle.getPropertyValue('--single-transform-list'), 'scale(4)');
+    assert_equals(computedStyle.getPropertyValue('--multiple-transform-list'), 'scale(3) translateX(4px)');
 
     assert_equals(computedStyle.backgroundColor, 'rgb(255, 192, 203)');
     assert_equals(computedStyle.color, 'rgb(128, 0, 128)');