Added a net::BidirectionalStream to expose a bidirectional streaming interface

net/http/bidirectional_stream.cc

Index: net/http/bidirectional_stream.cc
diff --git a/net/http/bidirectional_stream.cc b/net/http/bidirectional_stream.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d8c6064a299ff82b64a82ec0ede134484a44d0b0
--- /dev/null
+++ b/net/http/bidirectional_stream.cc
@@ -0,0 +1,17 @@
+// 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 "net/http/bidirectional_stream.h"
+
+namespace net {
+
+BidirectionalStream::Delegate::Delegate() {}
+
+BidirectionalStream::Delegate::~Delegate() {}
+
+BidirectionalStream::BidirectionalStream() {}
+
+BidirectionalStream::~BidirectionalStream() {}
+
+}  // namespace net