Add new chrome://proximity-auth WebUI for debugging Smart Lock.

components/proximity_auth/webui/url_constants.cc

Index: components/proximity_auth/webui/url_constants.cc
diff --git a/components/proximity_auth/webui/url_constants.cc b/components/proximity_auth/webui/url_constants.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a8978df372161669d4cbd5bd0df0e4472d9b164b
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+++ b/components/proximity_auth/webui/url_constants.cc
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+// Copyright 2015 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 "components/proximity_auth/webui/url_constants.h"
+
+namespace proximity_auth {
+
+const char kChromeUIProximityAuthHost[] = "proximity-auth";
+const char kChromeUIProximityAuthURL[] = "chrome://proximity-auth/";
+
+}  // namespace proximity_auth