uint32_t cros_gralloc_convert_format(int32_t format);
-cros_gralloc_handle_t cros_gralloc_convert_handle(buffer_handle_t handle);
+extern "C" cros_gralloc_handle_t cros_gralloc_convert_handle(buffer_handle_t handle);
int32_t cros_gralloc_sync_wait(int32_t acquire_fence);