Trace 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 258d4fe00405ace8cdbc1142eb342d0f1209c63e..8def9005e647b344685050b96c19bac4fa1e3e98 100644
--- a/src/heap/gc-idle-time-handler.cc
+++ b/src/heap/gc-idle-time-handler.cc
@@ -16,6 +16,27 @@ const int GCIdleTimeHandler::kMaxMarkCompactsInIdleRound = 7;
 const int GCIdleTimeHandler::kIdleScavengeThreshold = 5;
 
 
+void GCIdleTimeAction::Print() {
+  switch (type) {
+    case DO_NOTHING:
+      PrintF("no action");
+      break;
+    case DO_INCREMENTAL_MARKING:
+      PrintF("incremental marking with step %" V8_PTR_PREFIX "d", parameter);
+      break;
+    case DO_SCAVENGE:
+      PrintF("scavenge");
+      break;
+    case DO_FULL_GC:
+      PrintF("full GC");
+      break;
+    case DO_FINALIZE_SWEEPING:
+      PrintF("finalize sweeping");
+      break;
+  }
+}
+
+
 size_t GCIdleTimeHandler::EstimateMarkingStepSize(
     size_t idle_time_in_ms, size_t marking_speed_in_bytes_per_ms) {
   DCHECK(idle_time_in_ms > 0);