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

LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/complex-text-opacity-expected.txt

Index: LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/complex-text-opacity-expected.txt
diff --git a/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/complex-text-opacity-expected.txt b/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/complex-text-opacity-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..fb153ebcb1e4e1026615123083ccb905bccfdc49
--- /dev/null
+++ b/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/complex-text-opacity-expected.txt
@@ -0,0 +1,144 @@
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