Allow non-percentages for hsl and hwb

HSL and HWB have comma-less, "non-legacy" formats now with
css-color-4. In these formats saturation, lightness, whiteness and
blackness no longer need to be in percentages, but instead can be
bare numbers which get divided by 100 to represent percentages.

https://drafts.csswg.org/css-color-4/#typedef-modern-hsl-syntax
"""
The next two arguments are the saturation and lightness, respectively. For saturation, 100% or 100 is a fully-saturated, bright color, and 0% or 0 is a fully-unsaturated gray. For lightness, 50% or 50 represents the "normal" color, while 100% or 100 is white and 0% or 0 is black.
"""

Some colors that were assumed to be "invalid" for relative color use
bare numbers for hsl/hwb and thus are no longer invalid.

Bug: 1505787
Change-Id: Ie7fec239d0422da54a3d8ee0e46e64b1bee73fe2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5067499
Reviewed-by: Rune Lillesveen <[email protected]>
Commit-Queue: Aaron Krajeski <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1231332}

css/css-color/parsing/color-invalid-relative-color.html

@@ -36,11 +36,7 @@
     // hsl(from ...)
 
     // Testing invalid values.
-    test_invalid_value(`color`, `hsl(from rebeccapurple h 10% 10)`);
-    test_invalid_value(`color`, `hsl(from rebeccapurple h 10 10%)`);
     test_invalid_value(`color`, `hsl(from rebeccapurple 10% s l)`);
-    test_invalid_value(`color`, `hsl(from rgb(10%, 20%, 30%, 40%) h 10% 10)`);
-    test_invalid_value(`color`, `hsl(from rgb(10%, 20%, 30%, 40%) h 10 10%)`);
     test_invalid_value(`color`, `hsl(from rgb(10%, 20%, 30%, 40%) 10% s l)`);
 
     // Testing invalid component names
@@ -55,11 +51,7 @@
     // hwb(from ...)
 
     // Testing invalid values.
-    test_invalid_value(`color`, `hwb(from rebeccapurple h 10% 10)`);
-    test_invalid_value(`color`, `hwb(from rebeccapurple h 10 10%)`);
     test_invalid_value(`color`, `hwb(from rebeccapurple 10% w b)`);
-    test_invalid_value(`color`, `hwb(from rgb(10%, 20%, 30%, 40%) h 10% 10)`);
-    test_invalid_value(`color`, `hwb(from rgb(10%, 20%, 30%, 40%) h 10 10%)`);
     test_invalid_value(`color`, `hwb(from rgb(10%, 20%, 30%, 40%) 10% w b)`);
 
     // Testing invalid component names