Make sure we have non-zero idle time even after rounding to size_t

src/heap/gc-idle-time-handler.cc

Index: src/heap/gc-idle-time-handler.cc
diff --git a/src/heap/gc-idle-time-handler.cc b/src/heap/gc-idle-time-handler.cc
index 9bc7078c7461c1782006f5089f33dbbeb6e1a9b2..92fb5530ef57acb1e5e8650a93ee914c1ed4b3f7 100644
--- a/src/heap/gc-idle-time-handler.cc
+++ b/src/heap/gc-idle-time-handler.cc
@@ -191,7 +191,7 @@ bool GCIdleTimeHandler::ShouldDoFinalIncrementalMarkCompact(
 // that this currently may trigger a full garbage collection.
 GCIdleTimeAction GCIdleTimeHandler::Compute(double idle_time_in_ms,
                                             HeapState heap_state) {
-  if (idle_time_in_ms <= 0.0) {
+  if (static_cast<int>(idle_time_in_ms) <= 0) {
     if (heap_state.incremental_marking_stopped) {
       if (ShouldDoContextDisposalMarkCompact(
               heap_state.contexts_disposed,