[New Multicolumn] Make positionForPoint() work.

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

Index: LayoutTests/fast/multicol/vertical-rl/caret-range-outside-columns-rtl-expected.txt
diff --git a/LayoutTests/fast/multicol/vertical-rl/caret-range-outside-columns-rtl-expected.txt b/LayoutTests/fast/multicol/vertical-rl/caret-range-outside-columns-rtl-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9458921884955af42033c16b0d247f1841ab5e4c
--- /dev/null
+++ b/LayoutTests/fast/multicol/vertical-rl/caret-range-outside-columns-rtl-expected.txt
@@ -0,0 +1,40 @@
+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 right of the first column:
+PASS document.caretRangeFromPoint(550,340).startOffset is 0
+PASS document.caretRangeFromPoint(550,270).startOffset is 0
+PASS document.caretRangeFromPoint(550,211).startOffset is 0
+Below first column:
+PASS document.caretRangeFromPoint(550,350).startOffset is 0
+PASS document.caretRangeFromPoint(490,350).startOffset is 0
+PASS document.caretRangeFromPoint(470,350).startOffset is 4
+PASS document.caretRangeFromPoint(450,350).startOffset is 8
+Above third column:
+PASS document.caretRangeFromPoint(490,0).startOffset is 27
+PASS document.caretRangeFromPoint(470,0).startOffset is 31
+PASS document.caretRangeFromPoint(450,0).startOffset is 35
+In the gap between the first and second columns:
+PASS document.caretRangeFromPoint(499,211).startOffset is 3
+PASS document.caretRangeFromPoint(479,211).startOffset is 7
+PASS document.caretRangeFromPoint(459,211).startOffset is 11
+PASS document.caretRangeFromPoint(440,211).startOffset is 11
+PASS document.caretRangeFromPoint(499,210).startOffset is 12
+PASS document.caretRangeFromPoint(479,210).startOffset is 16
+PASS document.caretRangeFromPoint(459,210).startOffset is 20
+PASS document.caretRangeFromPoint(440,210).startOffset is 20
+In the gap between the second and third columns:
+PASS document.caretRangeFromPoint(499,111).startOffset is 15
+PASS document.caretRangeFromPoint(479,111).startOffset is 19
+PASS document.caretRangeFromPoint(459,111).startOffset is 23
+PASS document.caretRangeFromPoint(440,111).startOffset is 23
+PASS document.caretRangeFromPoint(499,110).startOffset is 24
+PASS document.caretRangeFromPoint(479,110).startOffset is 28
+PASS document.caretRangeFromPoint(459,110).startOffset is 32
+PASS document.caretRangeFromPoint(440,110).startOffset is 32
+PASS successfullyParsed is true
+
+TEST COMPLETE
+xxx xxx xxx xxx xxx xxx xxx xxx xxx