[New Multicolumn] Make positionForPoint() work.

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

Index: LayoutTests/fast/multicol/caret-range-outside-columns-expected.txt
diff --git a/LayoutTests/fast/multicol/caret-range-outside-columns-expected.txt b/LayoutTests/fast/multicol/caret-range-outside-columns-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..901b0d9e95ccfc78045a8eb02d11148391212341
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+++ b/LayoutTests/fast/multicol/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".
+
+
+PASS document.caretRangeFromPoint(50,0).startOffset is 0
+PASS document.caretRangeFromPoint(150,0).startOffset is 0
+PASS document.caretRangeFromPoint(189,0).startOffset is 0
+PASS document.caretRangeFromPoint(190,0).startOffset is 12
+PASS document.caretRangeFromPoint(250,0).startOffset is 12
+PASS document.caretRangeFromPoint(289,0).startOffset is 12
+PASS document.caretRangeFromPoint(290,0).startOffset is 24
+PASS document.caretRangeFromPoint(350,0).startOffset is 24
+PASS document.caretRangeFromPoint(450,0).startOffset is 24
+PASS document.caretRangeFromPoint(50,100).startOffset is 12
+PASS document.caretRangeFromPoint(150,100).startOffset is 12
+PASS document.caretRangeFromPoint(189,100).startOffset is 12
+PASS document.caretRangeFromPoint(190,100).startOffset is 24
+PASS document.caretRangeFromPoint(250,100).startOffset is 24
+PASS document.caretRangeFromPoint(289,100).startOffset is 24
+PASS document.caretRangeFromPoint(0,10).startOffset is 0
+PASS document.caretRangeFromPoint(0,30).startOffset is 0
+PASS document.caretRangeFromPoint(0,50).startOffset is 4
+PASS document.caretRangeFromPoint(0,70).startOffset is 8
+PASS document.caretRangeFromPoint(0,90).startOffset is 12
+PASS document.caretRangeFromPoint(400,10).startOffset is 24
+PASS document.caretRangeFromPoint(400,30).startOffset is 27
+PASS document.caretRangeFromPoint(400,50).startOffset is 31
+PASS document.caretRangeFromPoint(400,70).startOffset is 35
+PASS document.caretRangeFromPoint(180,20).startOffset is 3
+PASS document.caretRangeFromPoint(180,40).startOffset is 7
+PASS document.caretRangeFromPoint(180,60).startOffset is 11
+PASS document.caretRangeFromPoint(180,69).startOffset is 11
+PASS document.caretRangeFromPoint(280,20).startOffset is 15
+PASS document.caretRangeFromPoint(280,40).startOffset is 19
+PASS document.caretRangeFromPoint(280,60).startOffset is 23
+PASS document.caretRangeFromPoint(280,69).startOffset is 23
+PASS successfullyParsed is true
+
+TEST COMPLETE
+xxx xxx xxx xxx xxx xxx xxx xxx xxx