Adds support for headless chrome embedder mojo services

headless/public/util/black_hole_protocol_handler.h

Index: headless/public/util/black_hole_protocol_handler.h
diff --git a/headless/public/util/black_hole_protocol_handler.h b/headless/public/util/black_hole_protocol_handler.h
new file mode 100644
index 0000000000000000000000000000000000000000..7d72890483779779b9c17965130441f0b931a823
--- /dev/null
+++ b/headless/public/util/black_hole_protocol_handler.h
@@ -0,0 +1,31 @@
+// Copyright 2016 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.
+
+#ifndef HEADLESS_PUBLIC_UTIL_BLACK_HOLE_PROTOCOL_HANDLER_H_
+#define HEADLESS_PUBLIC_UTIL_BLACK_HOLE_PROTOCOL_HANDLER_H_
+
+#include <map>
+
+#include "net/url_request/url_request_job_factory.h"
+
+namespace headless {
+
+// A protocol handler that fails any request sent to it.
+class BlackHoleProtocolHandler
+    : public net::URLRequestJobFactory::ProtocolHandler {
+ public:
+  BlackHoleProtocolHandler();
+  ~BlackHoleProtocolHandler() override;
+
+  net::URLRequestJob* MaybeCreateJob(
+      net::URLRequest* request,
+      net::NetworkDelegate* network_delegate) const override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(BlackHoleProtocolHandler);
+};
+
+}  // namespace headless
+
+#endif  // HEADLESS_PUBLIC_UTIL_BLACK_HOLE_PROTOCOL_HANDLER_H_