Make copyToVector() robust against conservative GCs.

third_party/WebKit/Source/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 787 matching lines @@
     void swap(Vector& other)
     {
         Base::swapVectorBuffer(other);
         std::swap(m_size, other.m_size);
     }
 
     void reverse();
 
     template <typename VisitorDispatcher> void trace(VisitorDispatcher);
 
+    class GCForbiddenScope {
+        STACK_ALLOCATED();
+    public:
+        GCForbiddenScope()
+        {
+            Allocator::enterGCForbiddenScope();
+        }
+        ~GCForbiddenScope()
+        {
+            Allocator::leaveGCForbiddenScope();
+        }
+    };
+
 protected:
     using Base::checkUnusedSlots;
     using Base::clearUnusedSlots;
 
 private:
     void expandCapacity(size_t newMinCapacity);
     T* expandCapacity(size_t newMinCapacity, T*);
     T* expandCapacity(size_t newMinCapacity, const T* data)
     {
         return expandCapacity(newMinCapacity, const_cast<T*>(data));
@@ skipping 550 matching lines @@
     STATIC_ONLY(NeedsTracing);
     static const bool value = false;
 };
 #endif
 
 } // namespace WTF
 
 using WTF::Vector;
 
 #endif // WTF_Vector_h