Add RawPtr constructor taking a reference argument.

Source/wtf/RawPtr.h

 /*
  * Copyright (C) 2014 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 33 matching lines @@
 namespace WTF {
 
 template<typename T>
 class RawPtr {
     WTF_DISALLOW_CONSTRUCTION_FROM_ZERO(RawPtr);
     WTF_DISALLOW_ZERO_ASSIGNMENT(RawPtr);
 public:
     RawPtr() : m_ptr(0) { }
     RawPtr(std::nullptr_t) : m_ptr(0) { }
     RawPtr(T* ptr) : m_ptr(ptr) { }
+    RawPtr(T& reference) : m_ptr(&reference) { }

[Mikhail, 2014/03/05 06:33:43]

Shouldn't it be explicit? (to prevent from accidental deleting of a non-heap
allocated object)

     RawPtr(const RawPtr& other)
         : m_ptr(other.get())
     {
     }
 
     template<typename U>
     RawPtr(const RawPtr<U>& other)
         : m_ptr(other.get())
     {
     }
@@ skipping 62 matching lines @@
 template<typename T> inline T* getPtr(const RawPtr<T>& p)
 {
     return p.get();
 }
 
 } // namespace WTF
 
 using WTF::RawPtr;
 
 #endif