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

LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/text-letter-spacing-expected.txt

Index: LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/text-letter-spacing-expected.txt
diff --git a/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/text-letter-spacing-expected.txt b/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/text-letter-spacing-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5241039b82b55d6cd21ec70b2882b40ca510b195
--- /dev/null
+++ b/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/text-letter-spacing-expected.txt
@@ -0,0 +1,189 @@
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