Enable Shadow DOM for tests (#34299)

* Enable shadowdom implementation in all tests.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* Update test expectations.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

---------

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

tests/wpt/meta/css/cssom/CSSStyleSheet-constructable.html.ini

@@ -1,2 +1,96 @@
 [CSSStyleSheet-constructable.html]
-  expected: ERROR
+  [document.adoptedStyleSheets should initially have length 0.]
+    expected: FAIL
+
+  [new CSSStyleSheet produces empty CSSStyleSheet]
+    expected: FAIL
+
+  [title can be set in the CSSStyleSheet constructor]
+    expected: FAIL
+
+  [CSSStyleSheet.replace produces Promise<CSSStyleSheet>]
+    expected: FAIL
+
+  [Constructed style sheets can be applied on document]
+    expected: FAIL
+
+  [Constructed style sheets can be applied on shadow root]
+    expected: FAIL
+
+  [Re-attaching shadow host with adopted stylesheets work]
+    expected: FAIL
+
+  [Attaching a shadow root that already has adopted stylesheets work]
+    expected: FAIL
+
+  [Re-attaching shadow host and updating attributes work]
+    expected: FAIL
+
+  [Changes to constructed stylesheets through CSSOM is reflected]
+    expected: FAIL
+
+  [Constructed stylesheet can be used and modified in multiple TreeScopes]
+    expected: FAIL
+
+  [Stylesheets constructed on the main Document cannot be used in iframes]
+    expected: FAIL
+
+  [Stylesheet constructed on iframe cannot be used in the main Document]
+    expected: FAIL
+
+  [Adding non-constructed stylesheet to AdoptedStyleSheets is not allowed when the owner document of the stylesheet is in the same document tree as the AdoptedStyleSheets]
+    expected: FAIL
+
+  [Adding non-constructed stylesheet to AdoptedStyleSheets is not allowed when the owner document of the stylesheet and the AdoptedStyleSheets are in different document trees]
+    expected: FAIL
+
+  [CSSStyleSheet.replaceSync replaces stylesheet text synchronously]
+    expected: FAIL
+
+  [CSSStyleSheet.replaceSync correctly updates the style of its adopters synchronously]
+    expected: FAIL
+
+  [Adopted sheets are ordered after non-adopted sheets in the shadow root]
+    expected: FAIL
+
+  [Adopted sheets are ordered after non-adopted sheets in the document]
+    expected: FAIL
+
+  [Inserting an @import rule through insertRule on a constructed stylesheet throws an exception]
+    expected: FAIL
+
+  [CSSStyleSheet.replaceSync should not trigger any loads from @import rules]
+    expected: FAIL
+
+  [CSSStyleSheet.replace allows, but ignores, import rule inside]
+    expected: FAIL
+
+  [CSSStyleSheet.replace ignores @import rule but still loads other rules]
+    expected: FAIL
+
+  [CSSStyleSheet.replaceSync allows, but ignores, import rule inside]
+    expected: FAIL
+
+  [CSSStyleSheet.replace does not reject on failed imports]
+    expected: FAIL
+
+  [Cloning a shadow host will not clone shadow root, and also adoptedStyleSheets]
+    expected: FAIL
+
+  [Importing a shadow host will not copy shadow root, and also adoptedStyleSheets]
+    expected: FAIL
+
+  [Adopting a shadow host will empty adoptedStyleSheets if adopting to a different document]
+    expected: FAIL
+
+  [Adopting a shadow host's ancestor will empty adoptedStyleSheets if adopting to a different document]
+    expected: FAIL
+
+  [Forcing a style update after adding an adopted stylesheet on a disconnected shadow root should not crash.]
+    expected: FAIL
+
+  [Modifying an adopted stylesheet on a disconnected shadow root should not crash.]
+    expected: FAIL
+
+  [Constructing a sheet with the default base URL uses the constructor document's base URL for CSS rules]
+    expected: FAIL

tests/wpt/meta/css/cssom/adoptedstylesheets-observablearray.html.ini

@@ -1,5 +1,4 @@
 [adoptedstylesheets-observablearray.html]
-  expected: ERROR
   [document.adoptedStyleSheets should allow mutation in-place]
     expected: FAIL
 

tests/wpt/meta/css/cssom/getComputedStyle-detached-subtree.html.ini

@@ -1,5 +1,4 @@
 [getComputedStyle-detached-subtree.html]
-  expected: ERROR
   [getComputedStyle returns no style for element in non-rendered iframe (display: none) from iframe's window]
     expected: FAIL
 
@@ -8,3 +7,12 @@
 
   [getComputedStyle returns no style for detached element]
     expected: FAIL
+
+  [getComputedStyle returns no style for element outside the flat tree]
+    expected: FAIL
+
+  [getComputedStyle returns no style for descendant outside the flat tree]
+    expected: FAIL
+
+  [getComputedStyle returns no style for shadow tree outside of flattened tree]
+    expected: FAIL

tests/wpt/meta/css/cssom/insert-dir-rule-crash.html.ini

@@ -0,0 +1,2 @@
+[insert-dir-rule-crash.html]
+  expected: CRASH

tests/wpt/meta/css/cssom/insert-dir-rule-in-iframe-crash.html.ini

@@ -0,0 +1,2 @@
+[insert-dir-rule-in-iframe-crash.html]
+  expected: CRASH

tests/wpt/meta/css/cssom/selectorText-modification-restyle-002.html.ini

@@ -1,2 +1,6 @@
 [selectorText-modification-restyle-002.html]
-  expected: ERROR
+  [Check initial color.]
+    expected: FAIL
+
+  [Check that color changes correctly after shadow stylesheet selector and #container class is changed.]
+    expected: FAIL