Add a PassScopedPtr into base/memory.

base/bind_helpers.h

Index: base/bind_helpers.h
diff --git a/base/bind_helpers.h b/base/bind_helpers.h
index d7ddb2c49bab76629c952d132b30d9b6263b8a4c..4cd1309ff4ab54a7d6ff4fafc8a7fe193b721f45 100644
--- a/base/bind_helpers.h
+++ b/base/bind_helpers.h
@@ -277,6 +277,11 @@ template <typename T>
 T* Unwrap(const scoped_refptr<T>& o) { return o.get(); }
 
 template <typename T>
+PassScopedPtr<T> Unwrap(subtle::PassScopedPtrAnchor<T>& o) {
+  return PassScopedPtr<T>(&o);
+}
+
+template <typename T>
 const WeakPtr<T>& Unwrap(const WeakPtr<T>& o) { return o; }
 
 template <typename T>
@@ -302,6 +307,12 @@ struct MaybeRefcount<base::false_type, T[n]> {
 };
 
 template <typename T>
+struct MaybeRefcount<base::false_type, subtle::TransientPassScopedPtr<T> > {
+  static void AddRef(const subtle::PassScopedPtrAnchor<T>&) {}
+  static void Release(const subtle::PassScopedPtrAnchor<T>&) {}
+};
+
+template <typename T>
 struct MaybeRefcount<base::true_type, T*> {
   static void AddRef(T* o) { o->AddRef(); }
   static void Release(T* o) { o->Release(); }
@@ -334,6 +345,12 @@ struct MaybeRefcount<base::true_type, const T*> {
 };
 
 template <typename T>
+struct MaybeRefcount<base::true_type, subtle::TransientPassScopedPtr<T> > {
+  static void AddRef(const subtle::PassScopedPtrAnchor<T>&) {}
+  static void Release(const subtle::PassScopedPtrAnchor<T>&) {}
+};
+
+template <typename T>
 struct MaybeRefcount<base::true_type, WeakPtr<T> > {
   static void AddRef(const WeakPtr<T>&) {}
   static void Release(const WeakPtr<T>&) {}