With LSan, run initial heap cleaning GCs during shutdown.

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 246 matching lines @@
 
     // Add pages to the orphaned page pool to ensure any global GCs from this point
     // on will not trace objects on this thread's arenas.
     cleanupPages();
 }
 
 void ThreadState::cleanupMainThread()
 {
     ASSERT(isMainThread());
 
+#if defined(LEAK_SANITIZER)
+    // See comment below, clear out most garbage before releasing static
+    // persistents should some of the finalizers depend on touching
+    // these persistents.
+    ThreadHeap::collectAllGarbage();
+#endif
+
     releaseStaticPersistentNodes();
 
 #if defined(LEAK_SANITIZER)
     // If LSan is about to perform leak detection, after having released all
     // the registered static Persistent<> root references to global caches
     // that Blink keeps, follow up with a round of GCs to clear out all
     // what they referred to.
     //
     // This is not needed for caches over non-Oilpan objects, as they're
     // not scanned by LSan due to being held in non-global storage
@@ skipping 1246 matching lines @@
     threadDump->addScalar("dead_count", "objects", totalDeadCount);
     threadDump->addScalar("live_size", "bytes", totalLiveSize);
     threadDump->addScalar("dead_size", "bytes", totalDeadSize);
 
     WebMemoryAllocatorDump* heapsDump = BlinkGCMemoryDumpProvider::instance()->createMemoryAllocatorDumpForCurrentGC(heapsDumpName);
     WebMemoryAllocatorDump* classesDump = BlinkGCMemoryDumpProvider::instance()->createMemoryAllocatorDumpForCurrentGC(classesDumpName);
     BlinkGCMemoryDumpProvider::instance()->currentProcessMemoryDump()->addOwnershipEdge(classesDump->guid(), heapsDump->guid());
 }
 
 } // namespace blink