Fix mouse cursor update timer to be page-global instead of per-frame

LayoutTests/fast/events/mouse-cursor-style-change-iframe-expected.txt

Index: LayoutTests/fast/events/mouse-cursor-style-change-iframe-expected.txt
diff --git a/LayoutTests/fast/events/mouse-cursor-style-change-iframe-expected.txt b/LayoutTests/fast/events/mouse-cursor-style-change-iframe-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c0f915de1f511378922852d17d2a440a899bf8de
--- /dev/null
+++ b/LayoutTests/fast/events/mouse-cursor-style-change-iframe-expected.txt
@@ -0,0 +1,23 @@
+Test that a cursor change that occurs due only to a style change correctly considers iframes.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+
+Mouse moved to cursor changing div
+Cursor Info: type=Hand hotSpot=0,0
+PASS window.internals.getCurrentCursorInfo(document) is "type=Hand hotSpot=0,0"
+Changing cursor style
+PASS window.internals.getCurrentCursorInfo(document) is "type=Wait hotSpot=0,0"
+
+Now move mouse onto iframe above cursor changing div
+PASS document.elementFromPoint(100, y) is frame
+PASS document.elementsFromPoint(100, y).indexOf(container) > 0 is true
+PASS window.internals.getCurrentCursorInfo(document) is "type=IBeam hotSpot=0,0"
+
+Changing cursor style of the background should not affect the cursor as it sits over the iframe
+PASS window.internals.getCurrentCursorInfo(document) is "type=IBeam hotSpot=0,0"
+PASS successfullyParsed is true
+
+TEST COMPLETE
+