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 33 matching lines @@
 
   // Returns a uint8_t from the input or 0 if nothing remains. This is
   // equivalent to ConsumeValueInRange(0, 0xFF).
   uint8_t ConsumeUint8();
 
   // Returns a uint16_t from the input. If fewer than 2 bytes of data remain
   // will fill the most significant bytes with 0. This is equivalent to
   // ConsumeValueInRange(0, 0xFFFF).
   uint16_t ConsumeUint16();
 
+  // 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