Add fuzzer to test Fuzz URLRequestDataJob

net/base/fuzzed_data_provider.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_BASE_FUZZED_DATA_PROVIDER_H
 #define NET_BASE_FUZZED_DATA_PROVIDER_H
 
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 24 matching lines @@
   // |num_bits| must be less than 32.
   uint32_t ConsumeBits(size_t num_bits);
 
   // Same as ConsumeBits(1), but returns a bool.
   bool ConsumeBool();
 
   // Creates a value in the specified range, consuming only as much data is
   // needed.  Value may not uniformly distributed in that range.
   uint32_t ConsumeValueInRange(uint32_t min, uint32_t max);
 
+  // Reports the remaining bytes available for fuzzed input.
+  size_t remaining_bytes() { return remaining_data_.length(); }
+
  private:
   base::StringPiece remaining_data_;
 
   DISALLOW_COPY_AND_ASSIGN(FuzzedDataProvider);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_FUZZED_DATA_PROVIDER_H