Oilpan: Scale up the number of marking threads according to available processors

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 312 matching lines @@
 #endif
 {
     ASSERT(!**s_threadSpecific);
     **s_threadSpecific = this;
 
     InitializeHeaps<NumberOfHeaps>::init(m_heaps, this);
 
     m_weakCallbackStack = new CallbackStack();
 
     if (blink::Platform::current())
-        m_sweeperThread = adoptPtr(blink::Platform::current()->createThread("Blink GC Sweeper"));
+        m_sweeperThread = adoptPtr(blink::Platform::current()->createThread("Blink GC Sweeper Thread"));
 }
 
 ThreadState::~ThreadState()
 {
     checkThread();
     delete m_weakCallbackStack;
     m_weakCallbackStack = 0;
     for (int i = 0; i < NumberOfHeaps; i++)
         delete m_heaps[i];
     deleteAllValues(m_interruptors);
@@ skipping 938 matching lines @@
             return gcInfo;
         }
     }
     if (needLockForIteration)
         threadAttachMutex().unlock();
     return 0;
 }
 #endif
 
 }