Use invalidation sets for some pseudo elements.

LayoutTests/fast/css/dynamic-class-pseudo-elements-expected.txt

Index: LayoutTests/fast/css/dynamic-class-pseudo-elements-expected.txt
diff --git a/LayoutTests/fast/css/dynamic-class-pseudo-elements-expected.txt b/LayoutTests/fast/css/dynamic-class-pseudo-elements-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..010b6017e19ba835eb551884112f3082cf37e204
--- /dev/null
+++ b/LayoutTests/fast/css/dynamic-class-pseudo-elements-expected.txt
@@ -0,0 +1,25 @@
+Change classes affecting pseudo elements
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS getComputedStyle(r1, '::before').backgroundColor is transparent
+PASS internals.updateStyleAndReturnAffectedElementCount() is 3
+PASS getComputedStyle(r1, '::before').backgroundColor is green
+PASS getComputedStyle(r2, '::after').backgroundColor is transparent
+PASS internals.updateStyleAndReturnAffectedElementCount() is 3
+PASS getComputedStyle(r2, '::after').backgroundColor is green
+PASS getComputedStyle(r3, '::first-line').backgroundColor is transparent
+PASS internals.updateStyleAndReturnAffectedElementCount() is 9
+PASS getComputedStyle(r3, '::first-line').backgroundColor is green
+PASS getComputedStyle(r4, '::first-letter').backgroundColor is transparent
+PASS internals.updateStyleAndReturnAffectedElementCount() is 8
+PASS getComputedStyle(r4, '::first-letter').backgroundColor is green
+PASS successfullyParsed is true
+
+TEST COMPLETE
+ < Background of 'X' should be green
+Background of 'X' should be green > 
+Background should be green
+Background of first letter should be green
+