Enable idle GC for worker thread heaps.

third_party/WebKit/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 552 matching lines @@
 ThreadState* ThreadState::fromObject(const void* object) {
   ASSERT(object);
   BasePage* page = pageFromObject(object);
   ASSERT(page);
   ASSERT(page->arena());
   return page->arena()->getThreadState();
 }
 
 void ThreadState::performIdleGC(double deadlineSeconds) {
   ASSERT(checkThread());
-  ASSERT(isMainThread());
   ASSERT(Platform::current()->currentThread()->scheduler());
 
   if (gcState() != IdleGCScheduled)
     return;
 
   if (isGCForbidden()) {
     // If GC is forbidden at this point, try again.
     scheduleIdleGC();
     return;
   }
@@ skipping 12 matching lines @@
 
   TRACE_EVENT2("blink_gc", "ThreadState::performIdleGC", "idleDeltaInSeconds",
                idleDeltaInSeconds, "estimatedMarkingTime",
                m_heap->heapStats().estimatedMarkingTime());
   collectGarbage(BlinkGC::NoHeapPointersOnStack, BlinkGC::GCWithoutSweep,
                  BlinkGC::IdleGC);
 }
 
 void ThreadState::performIdleLazySweep(double deadlineSeconds) {
   ASSERT(checkThread());
-  ASSERT(isMainThread());
 
   // 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;
@@ skipping 22 matching lines @@
       break;
     }
   }
   accumulateSweepingTime(WTF::currentTimeMS() - startTime);
 
   if (sweepCompleted)
     postSweep();
 }
 
 void ThreadState::scheduleIdleGC() {
-  // TODO(haraken): Idle GC should be supported in worker threads as well.
-  if (!isMainThread())
-    return;
-
   if (isSweepingInProgress()) {
     setGCState(SweepingAndIdleGCScheduled);
     return;
   }
 
   // Some threads (e.g. PPAPI thread) don't have a scheduler.
   if (!Platform::current()->currentThread()->scheduler())
     return;
 
   Platform::current()->currentThread()->scheduler()->postNonNestableIdleTask(
       BLINK_FROM_HERE,
       WTF::bind(&ThreadState::performIdleGC, WTF::unretained(this)));
   setGCState(IdleGCScheduled);
 }
 
 void ThreadState::scheduleIdleLazySweep() {
-  // TODO(haraken): Idle complete sweep should be supported in worker threads.
-  if (!isMainThread())
-    return;
-
   // Some threads (e.g. PPAPI thread) don't have a scheduler.
   if (!Platform::current()->currentThread()->scheduler())
     return;
 
   Platform::current()->currentThread()->scheduler()->postIdleTask(
       BLINK_FROM_HERE,
       WTF::bind(&ThreadState::performIdleLazySweep, WTF::unretained(this)));
 }
 
 void ThreadState::schedulePreciseGC() {
@@ skipping 875 matching lines @@
     collectGarbage(BlinkGC::NoHeapPointersOnStack, BlinkGC::GCWithSweep,
                    BlinkGC::ForcedGC);
     size_t liveObjects = heap().heapStats().markedObjectSize();
     if (liveObjects == previousLiveObjects)
       break;
     previousLiveObjects = liveObjects;
   }
 }
 
 }  // namespace blink