Add font type to AAPT2

Test: make libaapt2_tests AaptTestAppOne
Change-Id: I8fbf01675a218cc3c0b59598b6b1ec173851e946
diff --git a/tools/aapt2/Resource.h b/tools/aapt2/Resource.h
index 78acb70..13330b5 100644
--- a/tools/aapt2/Resource.h
+++ b/tools/aapt2/Resource.h
@@ -46,6 +46,7 @@
   kColor,
   kDimen,
   kDrawable,
+  kFont,
   kFraction,
   kId,
   kInteger,