Introduce DONE state in idle notification handler.

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

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/heap/gc-idle-time-handler.h"
 #include "src/heap/gc-tracer.h"
 #include "src/utils.h"
 
 namespace v8 {
 namespace internal {
 
 const double GCIdleTimeHandler::kConservativeTimeRatio = 0.9;
 const size_t GCIdleTimeHandler::kMaxMarkCompactTimeInMs = 1000;
 const size_t GCIdleTimeHandler::kMinTimeForFinalizeSweeping = 100;
 const int GCIdleTimeHandler::kMaxMarkCompactsInIdleRound = 7;
 const int GCIdleTimeHandler::kIdleScavengeThreshold = 5;
 
 
 void GCIdleTimeAction::Print() {
   switch (type) {
+    case DONE:
+      PrintF("done");
+      break;
     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:
@@ skipping 36 matching lines @@
   return Min(result, kMaxMarkCompactTimeInMs);
 }
 
 
 GCIdleTimeAction GCIdleTimeHandler::Compute(size_t idle_time_in_ms,
                                             HeapState heap_state) {
   if (IsIdleRoundFinished()) {
     if (EnoughGarbageSinceLastIdleRound() || heap_state.contexts_disposed > 0) {
       StartIdleRound();
     } else {
-      return GCIdleTimeAction::Nothing();
+      return GCIdleTimeAction::Done();
     }
   }
   if (heap_state.incremental_marking_stopped) {
     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 ||
         (heap_state.size_of_objects < kSmallHeapSize &&
          heap_state.contexts_disposed > 0)) {
       // If there are no more than two GCs left in this idle round and we are
@@ skipping 17 matching lines @@
       idle_time_in_ms >= kMinTimeForFinalizeSweeping) {
     return GCIdleTimeAction::FinalizeSweeping();
   }
 
   size_t step_size = EstimateMarkingStepSize(
       idle_time_in_ms, heap_state.incremental_marking_speed_in_bytes_per_ms);
   return GCIdleTimeAction::IncrementalMarking(step_size);
 }
 }
 }