Oilpan: Allow clearing a vector during pre finalizer to disallocate the backing buffer

third_party/WebKit/Source/platform/wtf/Vector.h

 /*
  *  Copyright (C) 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Library General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 1608 matching lines @@
 }
 
 template <typename T, size_t inlineCapacity, typename Allocator>
 void Vector<T, inlineCapacity, Allocator>::ShrinkCapacity(size_t new_capacity) {
   if (new_capacity >= Capacity())
     return;
 
   if (new_capacity < size())
     Shrink(new_capacity);
 
-  if (Allocator::IsObjectResurrectionForbidden())
-    return;
-
   T* old_buffer = begin();
 #ifdef ANNOTATE_CONTIGUOUS_CONTAINER
   size_t old_capacity = Capacity();
 #endif
   if (new_capacity > 0) {
     if (Base::ShrinkBuffer(new_capacity)) {
       ANNOTATE_CHANGE_CAPACITY(begin(), old_capacity, size_, Capacity());
       return;
     }
 
+    if (Allocator::IsObjectResurrectionForbidden())
+      return;
+
     T* old_end = end();
     Base::AllocateBuffer(new_capacity);
     if (begin() != old_buffer) {
       ANNOTATE_NEW_BUFFER(begin(), Capacity(), size_);
       TypeOperations::Move(old_buffer, old_end, begin());
       ClearUnusedSlots(old_buffer, old_end);
       ANNOTATE_DELETE_BUFFER(old_buffer, old_capacity, size_);
     }
   } else {
     Base::ResetBufferPointer();
@@ skipping 261 matching lines @@
           visitor, *const_cast<T*>(buffer_entry));
     CheckUnusedSlots(Buffer() + size(), Buffer() + Capacity());
   }
 }
 
 }  // namespace WTF
 
 using WTF::Vector;
 
 #endif  // WTF_Vector_h