Oilpan: Trace ThreadState::performIdleLazySweep.

Source/platform/heap/ThreadState.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 686 matching lines @@
     // If we are not in a sweeping phase, there is nothing to do here.
     if (!isSweepingInProgress())
         return;
 
     // This check is here to prevent performIdleLazySweep() from being called
     // recursively. I'm not sure if it can happen but it would be safer to have
     // the check just in case.
     if (sweepForbidden())
         return;
 
+    TRACE_EVENT1("blink_gc", "ThreadState::performIdleLazySweep", "idleDeltaInSeconds", deadlineSeconds - Platform::current()->monotonicallyIncreasingTime());
+
     bool sweepCompleted = true;
     SweepForbiddenScope scope(this);
     {
         if (isMainThread())
             ScriptForbiddenScope::enter();
 
         for (int i = 0; i < NumberOfHeaps; i++) {
             // lazySweepWithDeadline() won't check the deadline until it sweeps
             // 10 pages. So we give a small slack for safety.
             double slack = 0.001;
@@ skipping 756 matching lines @@
         json->beginArray(it->key.ascii().data());
         for (size_t age = 0; age <= maxHeapObjectAge; ++age)
             json->pushInteger(it->value.ages[age]);
         json->endArray();
     }
     TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(TRACE_DISABLED_BY_DEFAULT("blink_gc"), statsName, this, json.release());
 }
 #endif
 
 } // namespace blink