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

net/http2/decoder/payload_decoders/ping_payload_decoder.h

Index: net/http2/decoder/payload_decoders/ping_payload_decoder.h
diff --git a/net/http2/decoder/payload_decoders/ping_payload_decoder.h b/net/http2/decoder/payload_decoders/ping_payload_decoder.h
new file mode 100644
index 0000000000000000000000000000000000000000..0eb10a2e5cc3c2a1ed5e7dcab4a40207f95ff1b7
--- /dev/null
+++ b/net/http2/decoder/payload_decoders/ping_payload_decoder.h
@@ -0,0 +1,43 @@
+// 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_PING_PAYLOAD_DECODER_H_
+#define NET_HTTP2_DECODER_PAYLOAD_DECODERS_PING_PAYLOAD_DECODER_H_
+
+// Decodes the payload of a PING frame; for the RFC, see:
+//     http://httpwg.org/specs/rfc7540.html#PING
+
+#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 PingPayloadDecoderPeer;
+}  // namespace test
+
+class NET_EXPORT_PRIVATE PingPayloadDecoder {
+ public:
+  // Starts the decoding of a PING 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 PING frame's payload that has been split across
+  // decode buffers.
+  DecodeStatus ResumeDecodingPayload(FrameDecoderState* state,
+                                     DecodeBuffer* db);
+
+ private:
+  friend class test::PingPayloadDecoderPeer;
+
+  DecodeStatus HandleStatus(FrameDecoderState* state, DecodeStatus status);
+
+  Http2PingFields ping_fields_;
+};
+
+}  // namespace net
+
+#endif  // NET_HTTP2_DECODER_PAYLOAD_DECODERS_PING_PAYLOAD_DECODER_H_