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

net/http2/hpack/decoder/hpack_varint_decoder.cc

Index: net/http2/hpack/decoder/hpack_varint_decoder.cc
diff --git a/net/http2/hpack/decoder/hpack_varint_decoder.cc b/net/http2/hpack/decoder/hpack_varint_decoder.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f04bd89d5b00272d28719d0dda8454f3e746af13
--- /dev/null
+++ b/net/http2/hpack/decoder/hpack_varint_decoder.cc
@@ -0,0 +1,36 @@
+// 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/http2/hpack/decoder/hpack_varint_decoder.h"
+
+#include <sstream>
+
+namespace net {
+
+std::string HpackVarintDecoder::DebugString() const {
+  std::stringstream ss;
+  ss << "HpackVarintDecoder(value=" << value_ << ", offset=" << offset_ << ")";
+  return ss.str();
+}
+
+DecodeStatus HpackVarintDecoder::StartForTest(uint8_t prefix_value,
+                                              uint8_t prefix_mask,
+                                              DecodeBuffer* db) {
+  return Start(prefix_value, prefix_mask, db);
+}
+
+DecodeStatus HpackVarintDecoder::StartExtendedForTest(uint8_t prefix_mask,
+                                                      DecodeBuffer* db) {
+  return StartExtended(prefix_mask, db);
+}
+
+DecodeStatus HpackVarintDecoder::ResumeForTest(DecodeBuffer* db) {
+  return Resume(db);
+}
+
+std::ostream& operator<<(std::ostream& out, const HpackVarintDecoder& v) {
+  return out << v.DebugString();
+}
+
+}  // namespace net