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

net/http2/decoder/payload_decoders/unknown_payload_decoder.h

Index: net/http2/decoder/payload_decoders/unknown_payload_decoder.h
diff --git a/net/http2/decoder/payload_decoders/unknown_payload_decoder.h b/net/http2/decoder/payload_decoders/unknown_payload_decoder.h
new file mode 100644
index 0000000000000000000000000000000000000000..26a1ee25988f28e681101331c7607437ce93b004
--- /dev/null
+++ b/net/http2/decoder/payload_decoders/unknown_payload_decoder.h
@@ -0,0 +1,33 @@
+// 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_PAYLOAD_DECODERS_UNKNOWN_PAYLOAD_DECODER_H_
+#define NET_HTTP2_DECODER_PAYLOAD_DECODERS_UNKNOWN_PAYLOAD_DECODER_H_
+
+// Decodes the payload of a frame whose type unknown.  According to the HTTP/2
+// specification (http://httpwg.org/specs/rfc7540.html#FrameHeader):
+//     Implementations MUST ignore and discard any frame that has
+//     a type that is unknown.
+
+#include "net/base/net_export.h"
+#include "net/http2/decoder/decode_buffer.h"
+#include "net/http2/decoder/decode_status.h"
+#include "net/http2/decoder/frame_decoder_state.h"
+
+namespace net {
+
+class NET_EXPORT_PRIVATE UnknownPayloadDecoder {
+ public:
+  // Starts decoding a payload of unknown type; just passes it to the listener.
+  DecodeStatus StartDecodingPayload(FrameDecoderState* state, DecodeBuffer* db);
+
+  // Resumes decoding a payload of unknown type that has been split across
+  // decode buffers.
+  DecodeStatus ResumeDecodingPayload(FrameDecoderState* state,
+                                     DecodeBuffer* db);
+};
+
+}  // namespace net
+
+#endif  // NET_HTTP2_DECODER_PAYLOAD_DECODERS_UNKNOWN_PAYLOAD_DECODER_H_