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

LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/basic/generic-family-changes-expected.txt

Index: LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/basic/generic-family-changes-expected.txt
diff --git a/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/basic/generic-family-changes-expected.txt b/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/basic/generic-family-changes-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5364a3c4f8557b086d45bd4445727a1f8f4c06bd
--- /dev/null
+++ b/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/basic/generic-family-changes-expected.txt
@@ -0,0 +1,43 @@
+layer at (0,0) size 800x600
+  RenderView at (0,0) size 800x600
+layer at (0,0) size 800x302
+  RenderBlock {HTML} at (0,0) size 800x302
+    RenderBody {BODY} at (8,8) size 784x278
+      RenderBlock (anonymous) at (0,0) size 784x54
+        RenderText {#text} at (0,0) size 778x54
+          text run at (0,0) width 529: "Tests of WebKit's intepretation of font sizes when no absolute font size is specified. "
+          text run at (529,0) width 249: "Percentages and logical keywords scale"
+          text run at (0,18) width 161: "to reflect the family type. "
+          text run at (161,18) width 608: "Opera 9 matches this behavior as well (except it has a bug with multiple font-family mappings as"
+          text run at (0,36) width 129: "in the first example)."
+      RenderBlock {PRE} at (0,67) size 784x15
+        RenderInline {SPAN} at (0,0) size 120x15
+          RenderText {#text} at (0,0) size 120x15
+            text run at (0,0) width 120: "Should be 13 px"
+      RenderBlock {PRE} at (0,95) size 784x15
+        RenderInline {SPAN} at (0,0) size 86x15
+          RenderText {#text} at (0,0) size 86x15
+            text run at (0,0) width 86: "Should be 13px"
+      RenderBlock {PRE} at (0,123) size 784x15
+        RenderInline {SPAN} at (0,0) size 86x15
+          RenderText {#text} at (0,0) size 86x15
+            text run at (0,0) width 86: "Should be 13px"
+      RenderBlock {P} at (0,154) size 784x18
+        RenderInline {SPAN} at (0,0) size 86x15
+          RenderText {#text} at (0,2) size 86x15
+            text run at (0,2) width 86: "Should be 13px"
+      RenderBlock {P} at (0,188) size 784x18
+        RenderInline {TT} at (0,0) size 100x18
+          RenderInline {SPAN} at (0,0) size 100x18
+            RenderText {#text} at (0,0) size 100x18
+              text run at (0,0) width 100: "Should be 16px"
+      RenderBlock {P} at (0,222) size 784x18
+        RenderInline {TT} at (0,0) size 100x15
+          RenderInline {SPAN} at (0,0) size 100x18
+            RenderText {#text} at (0,0) size 100x18
+              text run at (0,0) width 100: "Should be 16px"
+      RenderBlock {P} at (0,256) size 784x22
+        RenderInline {TT} at (0,0) size 125x15
+          RenderInline {SPAN} at (0,0) size 125x22
+            RenderText {#text} at (0,0) size 125x22
+              text run at (0,0) width 125: "Should be 19px"