Add support using EXPECT_EQ with NullableString16 objects.

base/strings/nullable_string16.cc

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/nullable_string16.h"

[Avi (use Gerrit), 2013/06/18 21:02:42]

I'll eventually fix this up, but this should be base/strings/nullable_string16.h
:)

+
+#include <ostream>
+
+#include "base/strings/utf_string_conversions.h"
+
+namespace base {
+
+std::ostream& operator<<(std::ostream& out, const NullableString16& value) {
+  return value.is_null() ? out << "(null)" : out << UTF16ToUTF8(value.string());
+}
+
+}  // namespace base