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

net/http2/hpack/decoder/hpack_string_collector.h

Index: net/http2/hpack/decoder/hpack_string_collector.h
diff --git a/net/http2/hpack/decoder/hpack_string_collector.h b/net/http2/hpack/decoder/hpack_string_collector.h
new file mode 100644
index 0000000000000000000000000000000000000000..1bc58310044b1cedb079cbf065aa25c16481b8a6
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+++ b/net/http2/hpack/decoder/hpack_string_collector.h
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+// 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_HPACK_DECODER_HPACK_STRING_COLLECTOR_H_
+#define NET_HTTP2_HPACK_DECODER_HPACK_STRING_COLLECTOR_H_
+
+// Supports tests of decoding HPACK strings.
+
+#include <stddef.h>
+
+#include <iosfwd>
+#include <string>
+
+#include "base/strings/string_piece.h"
+#include "net/http2/hpack/decoder/hpack_string_decoder_listener.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace net {
+namespace test {
+
+// Records the callbacks associated with a decoding a string; must
+// call Clear() between decoding successive strings.
+struct HpackStringCollector : public HpackStringDecoderListener {
+  enum CollectorState {
+    kGenesis,
+    kStarted,
+    kEnded,
+  };
+
+  HpackStringCollector();
+  HpackStringCollector(const std::string& str, bool huffman);
+
+  void Clear();
+  bool IsClear() const;
+  bool IsInProgress() const;
+  bool HasEnded() const;
+
+  void OnStringStart(bool huffman, size_t length) override;
+  void OnStringData(const char* data, size_t length) override;
+  void OnStringEnd() override;
+
+  ::testing::AssertionResult Collected(base::StringPiece str,
+                                       bool is_huffman_encoded) const;
+
+  std::string ToString() const;
+
+  std::string s;
+  size_t len;
+  bool huffman_encoded;
+  CollectorState state;
+};
+
+bool operator==(const HpackStringCollector& a, const HpackStringCollector& b);
+
+bool operator!=(const HpackStringCollector& a, const HpackStringCollector& b);
+
+std::ostream& operator<<(std::ostream& out, const HpackStringCollector& v);
+
+}  // namespace test
+}  // namespace net
+
+#endif  // NET_HTTP2_HPACK_DECODER_HPACK_STRING_COLLECTOR_H_