Don't recalculate style synchronously on hover/active.

LayoutTests/fast/css/hover-recalc-expected.txt

Index: LayoutTests/fast/css/hover-recalc-expected.txt
diff --git a/LayoutTests/fast/css/hover-recalc-expected.txt b/LayoutTests/fast/css/hover-recalc-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2ad1cc07485ee24f1f41b693fabe99a8f909906a
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+++ b/LayoutTests/fast/css/hover-recalc-expected.txt
@@ -0,0 +1,21 @@
+Check that mousemove does not recalc style synchronously.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS window.internals is defined.
+PASS window.eventSender is defined.
+PASS getComputedStyle(t1, null).backgroundColor is transparent
+PASS getComputedStyle(t2, null).backgroundColor is transparent
+PASS internals.updateStyleAndReturnAffectedElementCount() is 1
+PASS getComputedStyle(t1, null).backgroundColor is green
+PASS internals.updateStyleAndReturnAffectedElementCount() is 2
+PASS getComputedStyle(t2, null).backgroundColor is green
+PASS getComputedStyle(t2.firstChild, null).width is '150px'
+PASS internals.updateStyleAndReturnAffectedElementCount() is 2
+PASS getComputedStyle(t3, null).backgroundColor is green
+PASS getComputedStyle(t3.firstChild, null).width is '150px'
+PASS successfullyParsed is true
+
+TEST COMPLETE
+