CSS: WPT tests property values are supported.

test_computed_value now checks that the value is supported.

Change-Id: Ic8c38df6030b3689f4fdec30a55f230d6cc113d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1866498
Reviewed-by: Alison Maher <almaher@microsoft.com>
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Auto-Submit: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708034}

css/css-forced-color-adjust/parsing/forced-color-adjust-computed.html

@@ -6,13 +6,6 @@
 <script src="/css/support/computed-testcommon.js"></script>
 <div id="target"></div>
 <script>
-  test_computed_value("forced-color-adjust", "", "auto");
   test_computed_value("forced-color-adjust", "auto");
   test_computed_value("forced-color-adjust", "none");
-  // reserved and css-wide keywords.
-  test_computed_value("forced-color-adjust", "initial", "auto");
-  test_computed_value("forced-color-adjust", "inherit", "auto");
-  test_computed_value("forced-color-adjust", "unset", "auto");
-  test_computed_value("forced-color-adjust", "revert", "auto");
-  test_computed_value("forced-color-adjust", "default", "auto");
 </script>

css/css-forced-color-adjust/parsing/forced-color-adjust-invalid.html

@@ -10,4 +10,6 @@
   test_invalid_value("forced-color-adjust", "none none");
   test_invalid_value("forced-color-adjust", "none auto");
   test_invalid_value("forced-color-adjust", "1");
+  test_invalid_value("forced-color-adjust", "revert");
+  test_invalid_value("forced-color-adjust", "default");
 </script>

css/css-transitions/parsing/transition-timing-function-computed.html

@@ -13,8 +13,6 @@
 <div id="target"></div>
 <script>
 test_computed_value("transition-timing-function", "linear");
-test_computed_value("transition-timing-function", "", "ease");
-test_computed_value("transition-timing-function", "initial", "ease");
 
 test_computed_value("transition-timing-function", "ease");
 test_computed_value("transition-timing-function", "ease-in");

css/support/computed-testcommon.js

@@ -21,6 +21,7 @@ function test_computed_value(property, specified, computed) {
   test(() => {
     const target = document.getElementById('target');
     assert_true(property in getComputedStyle(target), property + " doesn't seem to be supported in the computed style");
+    assert_true(CSS.supports(property, specified), "'" + specified + "' is a supported value for " + property + ".");
     target.style[property] = '';
     target.style[property] = specified;