Add support for unsigned int64 in string_number_conversions

base/strings/string_number_conversions.cc

Index: base/strings/string_number_conversions.cc
diff --git a/base/strings/string_number_conversions.cc b/base/strings/string_number_conversions.cc
index bad7c2b0e5f97dc24f3430901c0b3fb06b72773d..fadc81a186f6631a5e5226e49a1e11b969ec2f70 100644
--- a/base/strings/string_number_conversions.cc
+++ b/base/strings/string_number_conversions.cc
@@ -302,12 +302,20 @@ class BaseHexIteratorRangeToInt64Traits
     : public BaseIteratorRangeToNumberTraits<ITERATOR, int64, 16> {
 };
 
+template<typename ITERATOR>
+class BaseHexIteratorRangeToUInt64Traits
+    : public BaseIteratorRangeToNumberTraits<ITERATOR, uint64, 16> {
+};
+
 typedef BaseHexIteratorRangeToIntTraits<StringPiece::const_iterator>
     HexIteratorRangeToIntTraits;
 
 typedef BaseHexIteratorRangeToInt64Traits<StringPiece::const_iterator>
     HexIteratorRangeToInt64Traits;
 
+typedef BaseHexIteratorRangeToUInt64Traits<StringPiece::const_iterator>
+    HexIteratorRangeToUInt64Traits;
+
 template<typename STR>
 bool HexStringToBytesT(const STR& input, std::vector<uint8>* output) {
   DCHECK_EQ(output->size(), 0u);
@@ -491,6 +499,11 @@ bool HexStringToInt64(const StringPiece& input, int64* output) {
     input.begin(), input.end(), output);
 }
 
+bool HexStringToUInt64(const StringPiece& input, uint64* output) {
+  return IteratorRangeToNumber<HexIteratorRangeToUInt64Traits>::Invoke(
+      input.begin(), input.end(), output);
+}
+
 bool HexStringToBytes(const std::string& input, std::vector<uint8>* output) {
   return HexStringToBytesT(input, output);
 }