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

src/heap/heap.cc

 // Copyright 2012 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/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/bits.h"
 #include "src/base/once.h"
@@ skipping 4467 matching lines @@
     }
   } else {
     isolate()->counters()->gc_idle_time_limit_overshot()->AddSample(
         actual_time_in_ms - idle_time_in_ms);
   }
 
   if (FLAG_trace_idle_notification) {
     PrintF("Idle notification: requested idle time %d ms, actual time %d ms [",
            idle_time_in_ms, actual_time_in_ms);
     action.Print();
-    PrintF("]\n");
+    PrintF("]");
+    if (FLAG_trace_idle_notification_verbose) {
+      PrintF("[");
+      heap_state.Print();
+      PrintF("]");
+    }
+    PrintF("\n");
   }
 
   contexts_disposed_ = 0;
   return result;
 }
 
 
 #ifdef DEBUG
 
 void Heap::Print() {
@@ skipping 1803 matching lines @@
       static_cast<int>(object_sizes_last_time_[index]));
   CODE_AGE_LIST_COMPLETE(ADJUST_LAST_TIME_OBJECT_COUNT)
 #undef ADJUST_LAST_TIME_OBJECT_COUNT
 
   MemCopy(object_counts_last_time_, object_counts_, sizeof(object_counts_));
   MemCopy(object_sizes_last_time_, object_sizes_, sizeof(object_sizes_));
   ClearObjectStats();
 }
 }
 }  // namespace v8::internal