Use an upper bound for marking time estimation in idle notification.

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 8def9005e647b344685050b96c19bac4fa1e3e98..a2d54286673cf1445c760d25cfda463879b1432a 100644
--- a/src/heap/gc-idle-time-handler.cc
+++ b/src/heap/gc-idle-time-handler.cc
@@ -10,7 +10,7 @@ namespace v8 {
 namespace internal {
 
 const double GCIdleTimeHandler::kConservativeTimeRatio = 0.9;
-const size_t GCIdleTimeHandler::kMaxMarkCompactTimeInMs = 1000000;
+const size_t GCIdleTimeHandler::kMaxMarkCompactTimeInMs = 1000;
 const size_t GCIdleTimeHandler::kMinTimeForFinalizeSweeping = 100;
 const int GCIdleTimeHandler::kMaxMarkCompactsInIdleRound = 7;
 const int GCIdleTimeHandler::kIdleScavengeThreshold = 5;
@@ -78,9 +78,10 @@ GCIdleTimeAction GCIdleTimeHandler::Compute(size_t idle_time_in_ms,
     }
   }
   if (heap_state.incremental_marking_stopped) {
-    if (idle_time_in_ms >= EstimateMarkCompactTime(
-                               heap_state.size_of_objects,
-                               heap_state.mark_compact_speed_in_bytes_per_ms)) {
+    size_t estimated_time_in_ms =
+        EstimateMarkCompactTime(heap_state.size_of_objects,
+                                heap_state.mark_compact_speed_in_bytes_per_ms);
+    if (idle_time_in_ms >= estimated_time_in_ms) {
       // If there are no more than two GCs left in this idle round and we are
       // allowed to do a full GC, then make those GCs full in order to compact
       // the code space.