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

LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/midword-break-after-breakable-char-expected.txt

Index: LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/midword-break-after-breakable-char-expected.txt
diff --git a/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/midword-break-after-breakable-char-expected.txt b/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/midword-break-after-breakable-char-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..75f4419f050aae0ef62d4920b42d8d2785a09acb
--- /dev/null
+++ b/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/midword-break-after-breakable-char-expected.txt
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