Add support for unsigned int64 in string_number_conversions

base/strings/string_number_conversions.h

 // Copyright (c) 2012 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 BASE_STRINGS_STRING_NUMBER_CONVERSIONS_H_
 #define BASE_STRINGS_STRING_NUMBER_CONVERSIONS_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 84 matching lines @@
 // Best effort conversion, see StringToInt above for restrictions.
 // Will only successful parse hex values that will fit into |output|, i.e.
 // -0x80000000 < |input| < 0x7FFFFFFF.
 BASE_EXPORT bool HexStringToInt(const StringPiece& input, int* output);
 
 // Best effort conversion, see StringToInt above for restrictions.
 // Will only successful parse hex values that will fit into |output|, i.e.
 // -0x8000000000000000 < |input| < 0x7FFFFFFFFFFFFFFF.
 BASE_EXPORT bool HexStringToInt64(const StringPiece& input, int64* output);
 
+// Best effort conversion, see StringToInt above for restrictions.
+// Will only successful parse hex values that will fit into |output|, i.e.
+// 0x0000000000000000 < |input| < 0xFFFFFFFFFFFFFFFF.
+// The string is not required to start with 0x.
+BASE_EXPORT bool HexStringToUInt64(const StringPiece& input, uint64* output);
+
 // Similar to the previous functions, except that output is a vector of bytes.
 // |*output| will contain as many bytes as were successfully parsed prior to the
 // error.  There is no overflow, but input.size() must be evenly divisible by 2.
 // Leading 0x or +/- are not allowed.
 BASE_EXPORT bool HexStringToBytes(const std::string& input,
                                   std::vector<uint8>* output);
 
 }  // namespace base
 
 #endif  // BASE_STRINGS_STRING_NUMBER_CONVERSIONS_H_
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