added gpr_types.h
diff --git a/tools/doxygen/Doxyfile.c++ b/tools/doxygen/Doxyfile.c++
index 46164b3..0278c12 100644
--- a/tools/doxygen/Doxyfile.c++
+++ b/tools/doxygen/Doxyfile.c++
@@ -847,6 +847,7 @@
include/grpc/impl/codegen/atm_gcc_atomic.h \
include/grpc/impl/codegen/atm_gcc_sync.h \
include/grpc/impl/codegen/atm_windows.h \
+include/grpc/impl/codegen/gpr_types.h \
include/grpc/impl/codegen/port_platform.h \
include/grpc/impl/codegen/slice.h \
include/grpc/impl/codegen/sync.h \
diff --git a/tools/doxygen/Doxyfile.c++.internal b/tools/doxygen/Doxyfile.c++.internal
index 02ad508..67a0803 100644
--- a/tools/doxygen/Doxyfile.c++.internal
+++ b/tools/doxygen/Doxyfile.c++.internal
@@ -847,6 +847,7 @@
include/grpc/impl/codegen/atm_gcc_atomic.h \
include/grpc/impl/codegen/atm_gcc_sync.h \
include/grpc/impl/codegen/atm_windows.h \
+include/grpc/impl/codegen/gpr_types.h \
include/grpc/impl/codegen/port_platform.h \
include/grpc/impl/codegen/slice.h \
include/grpc/impl/codegen/sync.h \
diff --git a/tools/doxygen/Doxyfile.core b/tools/doxygen/Doxyfile.core
index 41b5f8f..88cc34d 100644
--- a/tools/doxygen/Doxyfile.core
+++ b/tools/doxygen/Doxyfile.core
@@ -776,6 +776,7 @@
include/grpc/impl/codegen/atm_gcc_atomic.h \
include/grpc/impl/codegen/atm_gcc_sync.h \
include/grpc/impl/codegen/atm_windows.h \
+include/grpc/impl/codegen/gpr_types.h \
include/grpc/impl/codegen/port_platform.h \
include/grpc/impl/codegen/slice.h \
include/grpc/impl/codegen/sync.h \
@@ -817,6 +818,7 @@
include/grpc/impl/codegen/atm_gcc_atomic.h \
include/grpc/impl/codegen/atm_gcc_sync.h \
include/grpc/impl/codegen/atm_windows.h \
+include/grpc/impl/codegen/gpr_types.h \
include/grpc/impl/codegen/port_platform.h \
include/grpc/impl/codegen/slice.h \
include/grpc/impl/codegen/sync.h \
diff --git a/tools/doxygen/Doxyfile.core.internal b/tools/doxygen/Doxyfile.core.internal
index e5aea8b..e6d1eb6 100644
--- a/tools/doxygen/Doxyfile.core.internal
+++ b/tools/doxygen/Doxyfile.core.internal
@@ -776,6 +776,7 @@
include/grpc/impl/codegen/atm_gcc_atomic.h \
include/grpc/impl/codegen/atm_gcc_sync.h \
include/grpc/impl/codegen/atm_windows.h \
+include/grpc/impl/codegen/gpr_types.h \
include/grpc/impl/codegen/port_platform.h \
include/grpc/impl/codegen/slice.h \
include/grpc/impl/codegen/sync.h \
@@ -1160,6 +1161,7 @@
include/grpc/impl/codegen/atm_gcc_atomic.h \
include/grpc/impl/codegen/atm_gcc_sync.h \
include/grpc/impl/codegen/atm_windows.h \
+include/grpc/impl/codegen/gpr_types.h \
include/grpc/impl/codegen/port_platform.h \
include/grpc/impl/codegen/slice.h \
include/grpc/impl/codegen/sync.h \