Move unique name generation and tracking into //content.

content/test/test_runner_support.cc

Index: content/test/test_runner_support.cc
diff --git a/content/test/test_runner_support.cc b/content/test/test_runner_support.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f5ee65b0de3c63621182fcdee33241a39bdd5b66
--- /dev/null
+++ b/content/test/test_runner_support.cc
@@ -0,0 +1,16 @@
+// Copyright 2017 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 "content/public/test/test_runner_support.h"
+
+#include "content/renderer/render_frame_impl.h"
+#include "third_party/WebKit/public/web/WebLocalFrame.h"
+
+namespace content {
+
+std::string GetUniqueNameForFrame(blink::WebLocalFrame* frame) {
+  return RenderFrameImpl::FromWebFrame(frame)->unique_name();
+}
+
+}  // namespace content