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

net/http2/decoder/payload_decoders/priority_payload_decoder.h

Index: net/http2/decoder/payload_decoders/priority_payload_decoder.h
diff --git a/net/http2/decoder/payload_decoders/priority_payload_decoder.h b/net/http2/decoder/payload_decoders/priority_payload_decoder.h
new file mode 100644
index 0000000000000000000000000000000000000000..d41a404b8dfd13534a310c4543f32dc62ee6f6fb
--- /dev/null
+++ b/net/http2/decoder/payload_decoders/priority_payload_decoder.h
@@ -0,0 +1,44 @@
+// 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_PRIORITY_PAYLOAD_DECODER_H_
+#define NET_HTTP2_DECODER_PAYLOAD_DECODERS_PRIORITY_PAYLOAD_DECODER_H_
+
+// Decodes the payload of a PRIORITY frame.
+
+#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"
+#include "net/http2/http2_structures.h"
+
+namespace net {
+namespace test {
+class PriorityPayloadDecoderPeer;
+}  // namespace test
+
+class NET_EXPORT_PRIVATE PriorityPayloadDecoder {
+ public:
+  // Starts the decoding of a PRIORITY frame's payload, and completes it if
+  // the entire payload is in the provided decode buffer.
+  DecodeStatus StartDecodingPayload(FrameDecoderState* state, DecodeBuffer* db);
+
+  // Resumes decoding a PRIORITY frame that has been split across decode
+  // buffers.
+  DecodeStatus ResumeDecodingPayload(FrameDecoderState* state,
+                                     DecodeBuffer* db);
+
+ private:
+  friend class test::PriorityPayloadDecoderPeer;
+
+  // Determines whether to report the PRIORITY to the listener, wait for more
+  // input, or to report a Frame Size Error.
+  DecodeStatus HandleStatus(FrameDecoderState* state, DecodeStatus status);
+
+  Http2PriorityFields priority_fields_;
+};
+
+}  // namespace net
+
+#endif  // NET_HTTP2_DECODER_PAYLOAD_DECODERS_PRIORITY_PAYLOAD_DECODER_H_