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

LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/cg-vs-atsui-expected.txt

Index: LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/cg-vs-atsui-expected.txt
diff --git a/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/cg-vs-atsui-expected.txt b/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/cg-vs-atsui-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b295584e1f3af708c608dd8cee80e2961533e3ad
--- /dev/null
+++ b/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/cg-vs-atsui-expected.txt
@@ -0,0 +1,76 @@
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+  RenderView at (0,0) size 800x600
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+              text run at (1,0) width 280: "mmm mmm mmm mmm"
+          RenderText {#text} at (0,0) size 0x0
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+              text run at (1,0) width 280: "mmm mmm\x{300} mmm mmm"
+          RenderText {#text} at (0,0) size 0x0
+        RenderBlock {P} at (4,62) size 776x27
+          RenderInline {SPAN} at (0,0) size 280x27
+            RenderText {#text} at (0,0) size 280x27
+              text run at (0,0) width 280: "mmm mmm\x{300} mmm mmm"
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+        RenderBlock {P} at (4,93) size 776x27
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+            RenderText {#text} at (0,0) size 423x27
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+          RenderText {#text} at (422,0) size 145x27
+            text run at (422,0) width 145: " mmm mmm"
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+            RenderText {#text} at (0,0) size 280x27
+              text run at (0,0) width 280: "mmm mmm mmm mmm"
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+            text run at (279,0) width 288: " mmm mmm mmm mmm"
+        RenderBlock {P} at (4,155) size 776x27
+          RenderInline {SPAN} at (0,0) size 423x27
+            RenderText {#text} at (0,0) size 423x27
+              text run at (0,0) width 423: "mmm mmm mmm mmm mmm mmm"
+          RenderText {#text} at (422,0) size 145x27
+            text run at (422,0) width 145: " mmm mmm"
+      RenderBlock {HR} at (0,190) size 784x2 [border: (1px inset #EEEEEE)]
+      RenderBlock {DIV} at (0,200) size 784x158
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+          RenderInline {SPAN} at (0,0) size 224x25 [border: (1px solid #008000)]
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+              text run at (1,0) width 222: "mmm mmm\x{300} mmm mmm"
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+            RenderText {#text} at (0,0) size 222x23
+              text run at (0,0) width 222: "mmm mmm\x{300} mmm mmm"
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