Make logging a scoped_ptr<T> more useful.

base/memory/scoped_ptr.h

Index: base/memory/scoped_ptr.h
diff --git a/base/memory/scoped_ptr.h b/base/memory/scoped_ptr.h
index ae9eb0fee8bd202dcc5dda4ec6a64dec3b81d519..987ccfa804eadde2f89b1ac904ee77bd47b16d36 100644
--- a/base/memory/scoped_ptr.h
+++ b/base/memory/scoped_ptr.h
@@ -85,6 +85,7 @@
 #include <stdlib.h>
 
 #include <algorithm>  // For std::swap().
+#include <iosfwd>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ -585,4 +586,9 @@ scoped_ptr<T> make_scoped_ptr(T* ptr) {
   return scoped_ptr<T>(ptr);
 }
 
+template <typename T>
+std::ostream& operator<<(std::ostream& out, const scoped_ptr<T>& p) {
+  return out << p.get();
+}
+
 #endif  // BASE_MEMORY_SCOPED_PTR_H_