Create an antialiased virtual layout test group for font testing on Mac

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

Index: LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/international/khmer-selection-expected.txt
diff --git a/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/international/khmer-selection-expected.txt b/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/international/khmer-selection-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..498cfe95b525c7b6086ce9babb4e3deb2bfdd083
--- /dev/null
+++ b/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/international/khmer-selection-expected.txt
@@ -0,0 +1,46 @@
+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 19x18
+            RenderText {#text} at (0,2) size 19x18
+              text run at (0,2) width 19: "\x{179C}\x{17C9}\x{17C2}\x{1794}"
+          RenderText {#text} at (19,2) size 4x18
+            text run at (19,2) width 4: " "
+          RenderInline {A} at (0,0) size 33x18 [color=#0000EE]
+            RenderText {#text} at (23,2) size 33x18
+              text run at (23,2) width 33: "\x{179A}\x{17BC}\x{1794}\x{1797}\x{17B6}\x{1796}"
+          RenderText {#text} at (56,2) size 4x18
+            text run at (56,2) width 4: " "
+          RenderInline {A} at (0,0) size 20x18 [color=#0000EE]
+            RenderText {#text} at (60,2) size 20x18
+              text run at (60,2) width 20: "\x{1780}\x{17D2}\x{179A}\x{17BB}\x{1798}"
+          RenderText {#text} at (80,2) size 4x18
+            text run at (80,2) width 4: " "
+          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 532x18
+          text run at (0,0) width 532: "Some Harfbuzz shapers will output cluster logs which suggest that some glyphs had "
+        RenderInline {I} at (0,0) size 16x18
+          RenderText {#text} at (532,0) size 16x18
+            text run at (532,0) width 16: "no"
+        RenderText {#text} at (548,0) size 765x36
+          text run at (548,0) width 217: " contributing code points. This test"
+          text run at (0,18) width 174: "contains such text and uses "
+        RenderInline {TT} at (0,0) size 88x15
+          RenderText {#text} at (174,20) size 88x15
+            text run at (174,20) width 88: "eventSender"
+        RenderText {#text} at (262,18) size 442x18
+          text run at (262,18) width 442: " to select the text. You should see some of the above text selected and "
+        RenderInline {TT} at (0,0) size 80x15
+          RenderText {#text} at (704,20) size 80x15
+            text run at (704,20) width 80: "test_shell"
+        RenderText {#text} at (0,36) size 252x18
+          text run at (0,36) width 252: "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