added gpr_types.h
diff --git a/gRPC-Core.podspec b/gRPC-Core.podspec
index 13b4241..1a5a173 100644
--- a/gRPC-Core.podspec
+++ b/gRPC-Core.podspec
@@ -148,6 +148,7 @@
                       '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',
@@ -170,6 +171,7 @@
                       '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',