Linter should enforce Tests marked Slow or WontFix aren't allowed in TestExpectations

third_party/WebKit/LayoutTests/NeverFixTests

Index: third_party/WebKit/LayoutTests/NeverFixTests
diff --git a/third_party/WebKit/LayoutTests/NeverFixTests b/third_party/WebKit/LayoutTests/NeverFixTests
index e450439cb9ed71b709219255dfd0dc5f7081e95b..214ece0b93c8db4153b1e592ec0ea062184884f3 100644
--- a/third_party/WebKit/LayoutTests/NeverFixTests
+++ b/third_party/WebKit/LayoutTests/NeverFixTests
@@ -221,3 +221,13 @@ imported/web-platform-tests/html/obsolete/requirements-for-implementations/the-m
 [ Mac ] imported/web-platform-tests/html/dom/elements/requirements-relating-to-bidirectional-algorithm-formatting-characters/dir-isolation-009a.html [ WontFix ]
 [ Mac ] imported/web-platform-tests/html/dom/elements/requirements-relating-to-bidirectional-algorithm-formatting-characters/dir-isolation-009b.html [ WontFix ]
 [ Mac ] imported/web-platform-tests/html/dom/elements/requirements-relating-to-bidirectional-algorithm-formatting-characters/dir-isolation-009c.html [ WontFix ]
+
+# We could fix this test for us and upstream it if the test shell user agent
+# would let us differentiate test_shell and WebKit DumpTreeNode.
+crbug.com/7482 [ Win Mac ] http/tests/misc/timer-vs-loading.html [ WontFix ]
+
+# These tests are too slow with our MESA backend.  We can re-enable when we have
+# bots running tests on real hardware. Don't want to just delete these because they
+# pass in the virtual test suite version.
+webkit.org/b/49629 compositing/lots-of-img-layers.html [ WontFix ]
+webkit.org/b/49629 compositing/lots-of-img-layers-with-opacity.html [ WontFix ]