Add canExceedIdleDeadlineIfRequired function to Scheduler and use it in Oilpan

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 711 matching lines @@
 void ThreadState::performIdleGC(double deadlineSeconds)
 {
     ASSERT(isMainThread());
 
     m_hasPendingIdleTask = false;
 
     if (gcState() != IdleGCScheduled)
         return;
 
     double idleDeltaInSeconds = deadlineSeconds - Platform::current()->monotonicallyIncreasingTime();
-    if (idleDeltaInSeconds <= Heap::estimatedMarkingTime()) {
+    if (idleDeltaInSeconds <= Heap::estimatedMarkingTime() && !Scheduler::shared()->isMaximumIdleDeadline(deadlineSeconds)) {

[haraken, 2015/03/03 15:10:39]

Shall we add a comment on what this branch is doing?

[rmcilroy, 2015/03/17 10:33:30]

Done.

         scheduleIdleGC();
         return;
     }
 
     // FIXME: Make this precise once idle task is guaranteed to be not in nested loop.

[haraken, 2015/03/03 15:10:39]

Ross, Sami: Not related to this CL, is this FIXME not yet fixed?

[rmcilroy, 2015/03/03 15:20:01]

I'm working on this right now - I'll let you know when I have a WIP CL.

[rmcilroy, 2015/03/03 19:39:08]

CL is up at https://codereview.chromium.org/976723002/

     Heap::collectGarbage(HeapPointersOnStack, GCWithoutSweep);
 }
 
 void ThreadState::scheduleIdleGC()
 {
     if (!isMainThread())
         return;
 
     if (isSweepingInProgress()) {
         setGCState(SweepingAndIdleGCScheduled);
@@ skipping 532 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