Added --trace_idle_notification_verbose which prints out the idle notificatino heap state.

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 accb87c99b6d455bb28b4a06047dbcfab6bfb1c0..beede4cdee3723c2d1be759fead90382c5f49304 100644
--- a/src/heap/gc-idle-time-handler.cc
+++ b/src/heap/gc-idle-time-handler.cc
@@ -41,6 +41,25 @@ void GCIdleTimeAction::Print() {
 }
 
 
+void GCIdleTimeHandler::HeapState::Print() {
+  PrintF("contexts_disposed=%d ", contexts_disposed);
+  PrintF("contexts_disposal_rate=%f ", contexts_disposal_rate);
+  PrintF("size_of_objects=%" V8_PTR_PREFIX "d ", size_of_objects);
+  PrintF("incremental_marking_stopped=%d ", incremental_marking_stopped);
+  PrintF("can_start_incremental_marking=%d ", can_start_incremental_marking);
+  PrintF("sweeping_in_progress=%d ", sweeping_in_progress);
+  PrintF("mark_compact_speed=%" V8_PTR_PREFIX "d ",
+         mark_compact_speed_in_bytes_per_ms);
+  PrintF("incremental_marking_speed=%" V8_PTR_PREFIX "d ",
+         incremental_marking_speed_in_bytes_per_ms);
+  PrintF("scavenge_speed=%" V8_PTR_PREFIX "d ", scavenge_speed_in_bytes_per_ms);
+  PrintF("new_space_size=%" V8_PTR_PREFIX "d ", used_new_space_size);
+  PrintF("new_space_capacity=%" V8_PTR_PREFIX "d ", new_space_capacity);
+  PrintF("new_space_allocation_throughput=%" V8_PTR_PREFIX "d",
+         new_space_allocation_throughput_in_bytes_per_ms);
+}
+
+
 size_t GCIdleTimeHandler::EstimateMarkingStepSize(
     size_t idle_time_in_ms, size_t marking_speed_in_bytes_per_ms) {
   DCHECK(idle_time_in_ms > 0);