Run subset of CSP tests by default. (#36402)

This will establish a baseline for the changes from #36363.

Testing: New tests in CI.
Fixes: Part of #4577

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

tests/wpt/meta/content-security-policy/child-src/child-src-blocked.sub.html.ini

@@ -0,0 +1,3 @@
+[child-src-blocked.sub.html]
+  [Expecting logs: ["PASS IFrame #1 generated a load event.", "violated-directive=frame-src"\]]
+    expected: FAIL

tests/wpt/meta/content-security-policy/child-src/child-src-conflicting-frame-src.sub.html.ini

@@ -0,0 +1,3 @@
+[child-src-conflicting-frame-src.sub.html]
+  [Expecting logs: ["PASS IFrame #1 generated a load event.", "violated-directive=frame-src"\]]
+    expected: FAIL

tests/wpt/meta/content-security-policy/child-src/child-src-cross-origin-load.sub.html.ini

@@ -0,0 +1,3 @@
+[child-src-cross-origin-load.sub.html]
+  [Two of the three iframe are expected to load.]
+    expected: FAIL

tests/wpt/meta/content-security-policy/child-src/child-src-redirect-blocked.sub.html.ini

@@ -0,0 +1,3 @@
+[child-src-redirect-blocked.sub.html]
+  [Expecting logs: ["PASS IFrame #1 generated a load event.", "violated-directive=frame-src"\]]
+    expected: FAIL

tests/wpt/meta/content-security-policy/child-src/child-src-worker-blocked.sub.html.ini

@@ -0,0 +1,7 @@
+[child-src-worker-blocked.sub.html]
+  expected: ERROR
+  [Should throw a securitypolicyviolation event]
+    expected: TIMEOUT
+
+  [Should block worker because it does not match any directive including the deprecated 'child-src']
+    expected: TIMEOUT