Add HpackDecoderTables, static and dynamic tables for decoding HPACK.

net/http2/tools/http2_random.h

 // 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_TOOLS_HTTP2_RANDOM_H_
 #define NET_HTTP2_TOOLS_HTTP2_RANDOM_H_
 
 #include <stdint.h>
 
+#include <limits>
 #include <string>
 
 namespace net {
 namespace test {
 
 class RandomBase {
  public:
   virtual ~RandomBase() {}
   virtual bool OneIn(int n) = 0;
   virtual int32_t Uniform(int32_t n) = 0;
   virtual uint8_t Rand8() = 0;
   virtual uint16_t Rand16() = 0;
   virtual uint32_t Rand32() = 0;
   virtual uint64_t Rand64() = 0;
   virtual int32_t Next() = 0;
   virtual int32_t Skewed(int max_log) = 0;
   virtual std::string RandString(int length) = 0;
+
+  // STL UniformRandomNumberGenerator implementation.
+  typedef uint32_t result_type;
+  static constexpr result_type min() { return 0; }
+  static constexpr result_type max() {
+    return std::numeric_limits<uint32_t>::max();
+  }
+  result_type operator()() { return Rand32(); }
 };
 
+// Http2Random holds no state: instances use the same base::RandGenerator
+// with a global state.
 class Http2Random : public RandomBase {
  public:
   ~Http2Random() override {}
   bool OneIn(int n) override;
   int32_t Uniform(int32_t n) override;
   uint8_t Rand8() override;
   uint16_t Rand16() override;
   uint32_t Rand32() override;
   uint64_t Rand64() override;
   int32_t Next() override;
   int32_t Skewed(int max_log) override;
   std::string RandString(int length) override;
 };
 
 }  // namespace test
 }  // namespace net
 
 #endif  // NET_HTTP2_TOOLS_HTTP2_RANDOM_H_