Merge virtual mac-antialiasedtext and windows-directwrite test suites

LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/international/khmer-selection-expected.txt

-layer at (0,0) size 800x600
-  RenderView at (0,0) size 800x600
-layer at (0,0) size 800x129
-  RenderBlock {HTML} at (0,0) size 800x129
-    RenderBody {BODY} at (8,16) size 784x97
-      RenderBlock {P} at (0,0) size 784x27
-        RenderInline {NOBR} at (0,0) size 137x18
-          RenderInline {B} at (0,0) size 20x18
-            RenderText {#text} at (0,2) size 20x18
-              text run at (0,2) width 20: "\x{179C}\x{17C9}\x{17C2}\x{1794}"
-          RenderText {#text} at (19,2) size 5x18
-            text run at (19,2) width 5: " "
-          RenderInline {A} at (0,0) size 34x18 [color=#0000EE]
-            RenderText {#text} at (23,2) size 34x18
-              text run at (23,2) width 34: "\x{179A}\x{17BC}\x{1794}\x{1797}\x{17B6}\x{1796}"
-          RenderText {#text} at (56,2) size 5x18
-            text run at (56,2) width 5: " "
-          RenderInline {A} at (0,0) size 21x18 [color=#0000EE]
-            RenderText {#text} at (60,2) size 21x18
-              text run at (60,2) width 21: "\x{1780}\x{17D2}\x{179A}\x{17BB}\x{1798}"
-          RenderText {#text} at (80,2) size 5x18
-            text run at (80,2) width 5: " "
-          RenderInline {A} at (0,0) size 53x18 [color=#0000EE]
-            RenderText {#text} at (84,2) size 53x18
-              text run at (84,2) width 53: "\x{1790}\x{178F}\x{17AF}\x{1780}\x{179F}\x{17B6}\x{179A}"
-        RenderText {#text} at (0,0) size 0x0
-      RenderBlock {P} at (0,43) size 784x54
-        RenderText {#text} at (0,0) size 542x18
-          text run at (0,0) width 542: "Some Harfbuzz shapers will output cluster logs which suggest that some glyphs had "
-        RenderInline {I} at (0,0) size 17x18
-          RenderText {#text} at (541,0) size 17x18
-            text run at (541,0) width 17: "no"
-        RenderText {#text} at (557,0) size 780x36
-          text run at (557,0) width 223: " contributing code points. This test"
-          text run at (0,18) width 178: "contains such text and uses "
-        RenderInline {TT} at (0,0) size 87x15
-          RenderText {#text} at (177,20) size 87x15
-            text run at (177,20) width 87: "eventSender"
-        RenderText {#text} at (263,18) size 447x18
-          text run at (263,18) width 447: " to select the text. You should see some of the above text selected and"
-        RenderInline {TT} at (0,0) size 79x15
-          RenderText {#text} at (0,38) size 79x15
-            text run at (0,38) width 79: "test_shell"
-        RenderText {#text} at (78,36) size 262x18
-          text run at (78,36) width 262: " shouldn't trigger any assertions or crash."
-caret: position 0 of child 0 {#text} of child 0 {B} of child 1 {NOBR} of child 1 {P} of body