Run same tests for layout-2020 and layout-2013 (#30092)

Most tests were only being run for layout-2013, not for layout-2020.
This wasn't great since layout-2020 is now the default.

So this patch unifies the lists of included tests for both layouts.
For layout-2013 this implies adding css/css-content/, css/css-logical/
and css/css-masking/clip/.
For layout-2020 this implies adding several additional css tests, and
also tests like dom/, js/, html/, etc.

tests/wpt/meta/resource-timing/iframe-failed-commit.html.ini

@@ -1,5 +1,4 @@
 [iframe-failed-commit.html]
-  expected: ERROR
   [Precondition]
     expected: FAIL
 
@@ -7,13 +6,13 @@
     expected: FAIL
 
   [Cross-origin iframe that doesn't comply with CSP attribute gets reported]
-    expected: NOTRUN
+    expected: FAIL
 
   [Same-origin iframe that complies with CSP attribute gets reported]
     expected: FAIL
 
   [Cross-origin iframe that complies with CSP attribute gets reported]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Same-origin iframe that doesn't comply with CSP attribute gets reported]
     expected: FAIL
@@ -22,13 +21,25 @@
     expected: FAIL
 
   [Same-origin empty iframe with a 200 status gets reported]
-    expected: NOTRUN
+    expected: FAIL
 
   [Cross-origin empty iframe with a 200 status gets reported]
-    expected: NOTRUN
+    expected: FAIL
 
   [Test iframe from non-existent host gets reported]
     expected: FAIL
 
   [Test iframe redirecting to non-existent host gets reported]
     expected: FAIL
+
+  [Same-origin empty iframe with a 204 status gets reported]
+    expected: FAIL
+
+  [Same-origin empty iframe with a 205 status gets reported]
+    expected: FAIL
+
+  [Cross-origin empty iframe with a 204 status gets reported]
+    expected: FAIL
+
+  [Cross-origin empty iframe with a 205 status gets reported]
+    expected: FAIL