Oilpan: We need to collect all garbage before shutting down the worker thread

Source/heap/Heap.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 1283 matching lines @@
 
     // Call weak callbacks on objects that may now be pointing to dead
     // objects.
     while (popAndInvokeWeakPointerCallback(&marker)) { }
 
     // It is not permitted to trace pointers of live objects in the weak
     // callback phase, so the marking stack should still be empty here.
     s_markingStack->assertIsEmpty();
 }
 
+void Heap::collectAllGarbage(ThreadState::StackState stackState, GCType gcType)
+{
+    // FIXME: oilpan: we should perform a single GC and everything
+    // should die. Unfortunately it is not the case for all objects
+    // because the hierarchy was not completely moved to the heap and
+    // some heap allocated objects own objects that contain persistents
+    // pointing to other heap allocated objects.
+    for (int i = 0; i < 5; i++)
+        collectGarbage(stackState, gcType);
+}
+
 void Heap::getStats(HeapStats* stats)
 {
     stats->clear();
     ASSERT(ThreadState::isAnyThreadInGC());
     ThreadState::AttachedThreadStateSet& threads = ThreadState::attachedThreads();
     typedef ThreadState::AttachedThreadStateSet::iterator ThreadStateIterator;
     for (ThreadStateIterator it = threads.begin(), end = threads.end(); it != end; ++it) {
         HeapStats temp;
         (*it)->getStats(temp);
         stats->add(&temp);
@@ skipping 19 matching lines @@
 
 // Force template instantiations for the types that we need.
 template class HeapPage<FinalizedHeapObjectHeader>;
 template class HeapPage<HeapObjectHeader>;
 template class ThreadHeap<FinalizedHeapObjectHeader>;
 template class ThreadHeap<HeapObjectHeader>;
 
 CallbackStack* Heap::s_markingStack;
 CallbackStack* Heap::s_weakCallbackStack;
 }