[New Multicolumn] Make positionForPoint() work.

LayoutTests/fast/pagination/caret-range-outside-paged-y-rtl-vertical-rl-expected.txt

Index: LayoutTests/fast/pagination/caret-range-outside-paged-y-rtl-vertical-rl-expected.txt
diff --git a/LayoutTests/fast/pagination/caret-range-outside-paged-y-rtl-vertical-rl-expected.txt b/LayoutTests/fast/pagination/caret-range-outside-paged-y-rtl-vertical-rl-expected.txt
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index 0000000000000000000000000000000000000000..89265b8d757b19b6446c3b1818b726a2335ce072
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+++ b/LayoutTests/fast/pagination/caret-range-outside-paged-y-rtl-vertical-rl-expected.txt
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+Test that hitting areas outside a paged container takes us to the right text content on some page.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+To the right of page 1:
+PASS document.caretRangeFromPoint(360,91).startOffset is 0
+PASS document.caretRangeFromPoint(360,150).startOffset is 0
+PASS document.caretRangeFromPoint(360,300).startOffset is 0
+Below page 1:
+PASS document.caretRangeFromPoint(400,320).startOffset is 0
+PASS document.caretRangeFromPoint(330,320).startOffset is 0
+PASS document.caretRangeFromPoint(290,320).startOffset is 4
+PASS document.caretRangeFromPoint(250,320).startOffset is 8
+Scroll to page 3
+Above page 3:
+PASS document.caretRangeFromPoint(330,0).startOffset is 27
+PASS document.caretRangeFromPoint(290,0).startOffset is 31
+PASS document.caretRangeFromPoint(250,0).startOffset is 35
+PASS successfullyParsed is true
+
+TEST COMPLETE
+xxx xxx xxx xxx xxx xxx xxx xxx xxx