Revert "Revert "Grand unified closures""
diff --git a/tools/doxygen/Doxyfile.c++.internal b/tools/doxygen/Doxyfile.c++.internal
index 06b68c3..0a412dd 100644
--- a/tools/doxygen/Doxyfile.c++.internal
+++ b/tools/doxygen/Doxyfile.c++.internal
@@ -889,6 +889,7 @@
src/core/lib/http/httpcli.h \
src/core/lib/http/parser.h \
src/core/lib/iomgr/closure.h \
+src/core/lib/iomgr/combiner.h \
src/core/lib/iomgr/endpoint.h \
src/core/lib/iomgr/endpoint_pair.h \
src/core/lib/iomgr/error.h \
@@ -1001,6 +1002,7 @@
src/core/lib/http/httpcli.c \
src/core/lib/http/parser.c \
src/core/lib/iomgr/closure.c \
+src/core/lib/iomgr/combiner.c \
src/core/lib/iomgr/endpoint.c \
src/core/lib/iomgr/endpoint_pair_posix.c \
src/core/lib/iomgr/endpoint_pair_windows.c \