Move postGC out of CrossThreadPersistentRegion::LockScope

third_party/WebKit/Source/platform/heap/ThreadState.h

Index: third_party/WebKit/Source/platform/heap/ThreadState.h
diff --git a/third_party/WebKit/Source/platform/heap/ThreadState.h b/third_party/WebKit/Source/platform/heap/ThreadState.h
index 8769d2b77cfee3537285069420ecde2b432b98d7..451a17d85c15ae851844cdae2043ec45215789cb 100644
--- a/third_party/WebKit/Source/platform/heap/ThreadState.h
+++ b/third_party/WebKit/Source/platform/heap/ThreadState.h
@@ -230,8 +230,9 @@ class PLATFORM_EXPORT ThreadState {
   //
   // 1) preGC() is called.
   // 2) ThreadHeap::collectGarbage() is called. This marks live objects.
-  // 3) postGC() is called. This does thread-local weak processing,
-  //    pre-finalization, eager sweeping and heap compaction.
+  // 3) postGC() is called. This does thread-local weak processing.
+  // 4) preSweep() is called. This does pre-finalization, eager sweeping and
+  //    heap compaction.
   // 4) Lazy sweeping sweeps heaps incrementally. completeSweep() may be called
   //    to complete the sweeping.
   // 5) postSweep() is called.
@@ -245,6 +246,7 @@ class PLATFORM_EXPORT ThreadState {
   void preGC();
   void postGC(BlinkGC::GCType);
   void completeSweep();
+  void preSweep(BlinkGC::GCType);
   void postSweep();
   // makeConsistentForMutator() drops marks from marked objects and rebuild
   // free lists. This is called after taking a snapshot and before resuming