Add new HTTP/2 and HPACK decoder in net/http2/.

net/http2/decoder/decode_status.h

Index: net/http2/decoder/decode_status.h
diff --git a/net/http2/decoder/decode_status.h b/net/http2/decoder/decode_status.h
new file mode 100644
index 0000000000000000000000000000000000000000..e5fbeebc57c08a0ad66f8400594b2d5f1bad8659
--- /dev/null
+++ b/net/http2/decoder/decode_status.h
@@ -0,0 +1,32 @@
+// 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 NET_HTTP2_DECODER_DECODE_STATUS_H_
+#define NET_HTTP2_DECODER_DECODE_STATUS_H_
+
+// Enum DecodeStatus is used to report the status of decoding of many
+// types of HTTP/2 and HPACK objects.
+
+#include <ostream>
+
+#include "net/base/net_export.h"
+
+namespace net {
+
+enum class DecodeStatus {
+  // Decoding is done.
+  kDecodeDone,
+
+  // Decoder needs more input to be able to make progress.
+  kDecodeInProgress,
+
+  // Decoding failed (e.g. HPACK variable length integer is too large, or
+  // an HTTP/2 frame has padding declared to be larger than the payload).
+  kDecodeError,
+};
+NET_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& out, DecodeStatus v);
+
+}  // namespace net
+
+#endif  // NET_HTTP2_DECODER_DECODE_STATUS_H_