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

LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/atsui-partial-selection-expected.txt

Index: LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/atsui-partial-selection-expected.txt
diff --git a/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/atsui-partial-selection-expected.txt b/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/atsui-partial-selection-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..617bd1e8b5ff6ef3e20ff64e35bb8e21a731d5ab
--- /dev/null
+++ b/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/atsui-partial-selection-expected.txt
@@ -0,0 +1,32 @@
+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 784x576
+      RenderBlock {P} at (0,0) size 784x36
+        RenderText {#text} at (0,0) size 53x18
+          text run at (0,0) width 53: "Test for "
+        RenderInline {I} at (0,0) size 753x36
+          RenderInline {A} at (0,0) size 301x18 [color=#0000EE]
+            RenderText {#text} at (53,0) size 301x18
+              text run at (53,0) width 301: "http://bugs.webkit.org/show_bug.cgi?id=11124"
+          RenderText {#text} at (354,0) size 753x36
+            text run at (354,0) width 4: " "
+            text run at (358,0) width 395: "REGRESSION (r14297): No drag image for partially-selected"
+            text run at (0,18) width 79: "complex text"
+        RenderText {#text} at (79,18) size 4x18
+          text run at (79,18) width 4: "."
+      RenderBlock {P} at (0,52) size 784x18
+        RenderText {#text} at (0,0) size 144x18
+          text run at (0,0) width 144: "This should look like \x{201C}"
+        RenderInline {SPAN} at (0,0) size 84x18 [color=#008000]
+          RenderText {#text} at (144,0) size 84x18
+            text run at (144,0) width 84: "Lore\x{300}m ipsum"
+        RenderText {#text} at (228,0) size 15x18
+          text run at (228,0) width 15: "\x{201D}: "
+        RenderInline {SPAN} at (0,0) size 88x18
+          RenderText {#text} at (243,0) size 88x18
+            text run at (243,0) width 88: " Lore\x{300}m ipsum"
+        RenderText {#text} at (0,0) size 0x0
+selection start: position 1 of child 0 {#text} of child 3 {SPAN} of child 2 {P} of body
+selection end:   position 13 of child 0 {#text} of child 3 {SPAN} of child 2 {P} of body