[New Multicolumn] Make positionForPoint() work.

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

Index: LayoutTests/fast/pagination/caret-range-outside-paged-y-expected.txt
diff --git a/LayoutTests/fast/pagination/caret-range-outside-paged-y-expected.txt b/LayoutTests/fast/pagination/caret-range-outside-paged-y-expected.txt
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index 0000000000000000000000000000000000000000..cdf99badbfb595672615eb0c0ce21545fc3d1b38
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+++ b/LayoutTests/fast/pagination/caret-range-outside-paged-y-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".
+
+
+Above page 1:
+PASS document.caretRangeFromPoint(50,0).startOffset is 0
+PASS document.caretRangeFromPoint(150,0).startOffset is 0
+PASS document.caretRangeFromPoint(300,0).startOffset is 0
+To the left of page 1:
+PASS document.caretRangeFromPoint(0,20).startOffset is 0
+PASS document.caretRangeFromPoint(0,60).startOffset is 0
+PASS document.caretRangeFromPoint(0,100).startOffset is 4
+PASS document.caretRangeFromPoint(0,140).startOffset is 8
+To the right of page 1:
+PASS document.caretRangeFromPoint(400,20).startOffset is 0
+PASS document.caretRangeFromPoint(400,60).startOffset is 3
+PASS document.caretRangeFromPoint(400,100).startOffset is 7
+PASS document.caretRangeFromPoint(400,140).startOffset is 11
+Scroll to page 2
+To the left of page 2:
+PASS document.caretRangeFromPoint(0,60).startOffset is 12
+PASS document.caretRangeFromPoint(0,100).startOffset is 16
+PASS document.caretRangeFromPoint(0,140).startOffset is 20
+To the right of page 2:
+PASS document.caretRangeFromPoint(400,60).startOffset is 15
+PASS document.caretRangeFromPoint(400,100).startOffset is 19
+PASS document.caretRangeFromPoint(400,140).startOffset is 23
+Scroll to page 3
+To the left of page 3:
+PASS document.caretRangeFromPoint(0,60).startOffset is 24
+PASS document.caretRangeFromPoint(0,100).startOffset is 28
+PASS document.caretRangeFromPoint(0,140).startOffset is 32
+To the right of page 3:
+PASS document.caretRangeFromPoint(400,60).startOffset is 27
+PASS document.caretRangeFromPoint(400,100).startOffset is 31
+PASS document.caretRangeFromPoint(400,140).startOffset is 35
+PASS successfullyParsed is true
+
+TEST COMPLETE
+xxx xxx xxx xxx xxx xxx xxx xxx xxx