Add HpackDecoder3, an adapter using HpackDecoder (in net/http2/hpack/decoder).

net/spdy/hpack/hpack_decoder2_test.cc

 // 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.
 
 #include "net/spdy/hpack/hpack_decoder2.h"
 
 // Tests of HpackDecoder2.
 
 #include <string>
 #include <tuple>
@@ skipping 547 matching lines @@
   //                                         |     Decoded:
   //                                         | www.example.com
   //                                         | -> :authority: www.example.com
 
   string first = a2b_hex("418cf1e3c2e5f23a6ba0ab90f4ff");
   EXPECT_TRUE(DecodeHeaderBlock(first));
   first = a2b_hex("418df1e3c2e5f23a6ba0ab90f4ffff");
   EXPECT_FALSE(DecodeHeaderBlock(first));
 }
 
-// Round-tripping the header set from E.2.1 should work.
-TEST_P(HpackDecoder2Test, BasicE21) {
+// Round-tripping the header set from RFC 7541 C.3.1 should work.
+// http://httpwg.org/specs/rfc7541.html#rfc.section.C.3.1
+TEST_P(HpackDecoder2Test, BasicC31) {
   HpackEncoder encoder(ObtainHpackHuffmanTable());
 
   SpdyHeaderBlock expected_header_set;
   expected_header_set[":method"] = "GET";
   expected_header_set[":scheme"] = "http";
   expected_header_set[":path"] = "/";
   expected_header_set[":authority"] = "www.example.com";
 
   string encoded_header_set;
   EXPECT_TRUE(
       encoder.EncodeHeaderSet(expected_header_set, &encoded_header_set));
 
   EXPECT_TRUE(DecodeHeaderBlock(encoded_header_set));
   EXPECT_EQ(expected_header_set, decoded_block());
 }
 
-TEST_P(HpackDecoder2Test, SectionD4RequestHuffmanExamples) {
+// RFC 7541, Section C.4: Request Examples with Huffman Coding
+// http://httpwg.org/specs/rfc7541.html#rfc.section.C.4
+TEST_P(HpackDecoder2Test, SectionC4RequestHuffmanExamples) {
   // TODO(jamessynge): Use net/http2/hpack/tools/hpack_example.h to parse the
   // example directly, instead of having it as a comment.
   // 82                                      | == Indexed - Add ==
   //                                         |   idx = 2
   //                                         | -> :method: GET
   // 86                                      | == Indexed - Add ==
   //                                         |   idx = 6
   //                                         | -> :scheme: http
   // 84                                      | == Indexed - Add ==
   //                                         |   idx = 4
@@ skipping 99 matching lines @@
       Pair(":authority", "www.example.com"),
       Pair("custom-key", "custom-value")));
   // clang-format on
 
   expectEntry(62, 54, "custom-key", "custom-value");
   expectEntry(63, 53, "cache-control", "no-cache");
   expectEntry(64, 57, ":authority", "www.example.com");
   EXPECT_EQ(164u, decoder_peer_.header_table()->size());
 }
 
-TEST_P(HpackDecoder2Test, SectionD6ResponseHuffmanExamples) {
+// RFC 7541, Section C.6: Response Examples with Huffman Coding
+// http://httpwg.org/specs/rfc7541.html#rfc.section.C.6
+TEST_P(HpackDecoder2Test, SectionC6ResponseHuffmanExamples) {
   decoder_.ApplyHeaderTableSizeSetting(256);
 
   // 48                                      | == Literal indexed ==
   //                                         |   Indexed name (idx = 8)
   //                                         |     :status
   // 82                                      |   Literal value (len = 3)
   //                                         |     Huffman encoded:
   // 6402                                    | d.
   //                                         |     Decoded:
   //                                         | 302
@@ skipping 228 matching lines @@
   string joined_values = expected_header_set[name].as_string();
   EXPECT_EQ(joined_values.size(),
             2 * value1.size() + 2 * value2.size() + 2 * value3.size() + 5);
 
   EXPECT_EQ(expected_header_set, decoded_block());
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace net