[New Multicolumn] Make positionForPoint() work.

LayoutTests/fast/multicol/vertical-lr/caret-range-outside-columns-expected.txt

Index: LayoutTests/fast/multicol/vertical-lr/caret-range-outside-columns-expected.txt
diff --git a/LayoutTests/fast/multicol/vertical-lr/caret-range-outside-columns-expected.txt b/LayoutTests/fast/multicol/vertical-lr/caret-range-outside-columns-expected.txt
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index 0000000000000000000000000000000000000000..a20f63928647a75deb86cfc1cd34076670b5de83
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+++ b/LayoutTests/fast/multicol/vertical-lr/caret-range-outside-columns-expected.txt
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+Test that hitting areas outside columns takes us to the right text content inside columns.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+To the left of the first column:
+PASS document.caretRangeFromPoint(0,10).startOffset is 0
+PASS document.caretRangeFromPoint(0,70).startOffset is 0
+PASS document.caretRangeFromPoint(0,109).startOffset is 0
+To the left of the second column:
+PASS document.caretRangeFromPoint(0,110).startOffset is 12
+PASS document.caretRangeFromPoint(0,170).startOffset is 12
+PASS document.caretRangeFromPoint(0,209).startOffset is 12
+To the left of the third column:
+PASS document.caretRangeFromPoint(0,210).startOffset is 24
+PASS document.caretRangeFromPoint(0,270).startOffset is 24
+PASS document.caretRangeFromPoint(0,309).startOffset is 24
+To the right of the first column:
+PASS document.caretRangeFromPoint(400,10).startOffset is 12
+PASS document.caretRangeFromPoint(400,70).startOffset is 12
+PASS document.caretRangeFromPoint(400,109).startOffset is 12
+To the right of the second column:
+PASS document.caretRangeFromPoint(400,110).startOffset is 24
+PASS document.caretRangeFromPoint(400,170).startOffset is 24
+PASS document.caretRangeFromPoint(400,209).startOffset is 24
+Above first column:
+PASS document.caretRangeFromPoint(90,0).startOffset is 0
+PASS document.caretRangeFromPoint(110,0).startOffset is 0
+PASS document.caretRangeFromPoint(130,0).startOffset is 4
+PASS document.caretRangeFromPoint(150,0).startOffset is 8
+PASS document.caretRangeFromPoint(170,0).startOffset is 12
+Below third column:
+PASS document.caretRangeFromPoint(90,350).startOffset is 24
+PASS document.caretRangeFromPoint(110,350).startOffset is 27
+PASS document.caretRangeFromPoint(130,350).startOffset is 31
+PASS document.caretRangeFromPoint(150,350).startOffset is 35
+In the gap between the first and second columns:
+PASS document.caretRangeFromPoint(100,109).startOffset is 3
+PASS document.caretRangeFromPoint(120,109).startOffset is 7
+PASS document.caretRangeFromPoint(140,109).startOffset is 11
+PASS document.caretRangeFromPoint(159,109).startOffset is 11
+PASS document.caretRangeFromPoint(100,110).startOffset is 12
+PASS document.caretRangeFromPoint(120,110).startOffset is 16
+PASS document.caretRangeFromPoint(140,110).startOffset is 20
+PASS document.caretRangeFromPoint(159,110).startOffset is 20
+In the gap between the second and third columns:
+PASS document.caretRangeFromPoint(100,209).startOffset is 15
+PASS document.caretRangeFromPoint(120,209).startOffset is 19
+PASS document.caretRangeFromPoint(140,209).startOffset is 23
+PASS document.caretRangeFromPoint(159,209).startOffset is 23
+PASS document.caretRangeFromPoint(100,210).startOffset is 24
+PASS document.caretRangeFromPoint(120,210).startOffset is 28
+PASS document.caretRangeFromPoint(140,210).startOffset is 32
+PASS document.caretRangeFromPoint(159,210).startOffset is 32
+PASS successfullyParsed is true
+
+TEST COMPLETE
+xxx xxx xxx xxx xxx xxx xxx xxx xxx