Add missing include

src/core/lib/iomgr/timer_uv.c

@@ -38,6 +38,7 @@
 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
 
+#include "src/core/lib/debug/trace.h"
 #include "src/core/lib/iomgr/timer.h"
 
 #include <uv.h>