Disable failing perf tests in blink_perf.css

TBR=crouleau@chromium.org
NOTRY=true

Bug: 983728
Change-Id: Id54a27c11f87b8471a476f629f62d9e21098f39a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1700378
Commit-Queue: John Chen <johnchen@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#677115}

tools/perf/expectations.config

@@ -58,6 +58,15 @@ crbug.com/978159 [ Nexus5X_Webview ] blink_perf.canvas/* [ Skip ]
 
 # Benchmark: blink_perf.css
 crbug.com/891878 [ Nexus5X_Webview ] blink_perf.css/CustomPropertiesVarAlias.html [ Skip ]
+crbug.com/983728 [ All ] blink_perf.css/ClassDescendantSelector.html [ Skip ]
+crbug.com/983728 [ All ] blink_perf.css/ClassInvalidation.html [ Skip ]
+crbug.com/983728 [ All ] blink_perf.css/CustomPropertiesCascade.html [ Skip ]
+crbug.com/983728 [ All ] blink_perf.css/CustomPropertiesNonRootInheritance.html [ Skip ]
+crbug.com/983728 [ All ] blink_perf.css/CustomPropertiesRootInheritance.html [ Skip ]
+crbug.com/983728 [ All ] blink_perf.css/CustomPropertiesVarAlias.html [ Skip ]
+crbug.com/983728 [ All ] blink_perf.css/FocusUpdate.html [ Skip ]
+crbug.com/983728 [ All ] blink_perf.css/PseudoClassSelectors.html [ Skip ]
+crbug.com/983728 [ All ] blink_perf.css/SelectorCountScaling.html [ Skip ]
 
 # Benchmark: blink_perf.events
 crbug.com/963945 [ Nexus5X_Webview ] blink_perf.events/EventsDispatchingInDeeplyNestedV0ShadowTrees.html [ Skip ]