Merge virtual mac-antialiasedtext and windows-directwrite test suites

LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/international/rtl-caret-expected.txt

-layer at (0,0) size 800x600
-  RenderView at (0,0) size 800x600
-layer at (0,0) size 800x600
-  RenderBlock {HTML} at (0,0) size 800x600
-    RenderBody {BODY} at (8,8) size 784x584
-      RenderBlock {P} at (0,0) size 784x36
-        RenderText {#text} at (0,0) size 177x18
-          text run at (0,0) width 177: "This is a regression test for "
-        RenderInline {I} at (0,0) size 735x36
-          RenderInline {A} at (0,0) size 355x18 [color=#0000EE]
-            RenderText {#text} at (176,0) size 355x18
-              text run at (176,0) width 355: "http://bugzilla.opendarwin.org/show_bug.cgi?id=8866"
-          RenderText {#text} at (530,0) size 735x36
-            text run at (530,0) width 5: " "
-            text run at (534,0) width 201: "REGRESSION: Incorrect caret"
-            text run at (0,18) width 127: "position in RTL text"
-        RenderText {#text} at (126,18) size 5x18
-          text run at (126,18) width 5: "."
-      RenderBlock {P} at (0,52) size 784x18
-        RenderText {#text} at (0,0) size 351x18
-          text run at (0,0) width 351: "The caret should be in the middle of the Hebrew word."
-      RenderBlock {HR} at (0,86) size 784x2 [border: (1px inset #EEEEEE)]
-      RenderBlock {DIV} at (0,96) size 784x19
-        RenderText {#text} at (0,1) size 64x18
-          text run at (0,1) width 64 RTL: "\x{5D0}\x{5D5}\x{5DB}\x{5DE}\x{5E0}\x{5D9}\x{5D5}\x{5EA}"
-caret: position 5 of child 0 {#text} of child 7 {DIV} of body