This will be used in the upcoming Minidump context structures.
This also updates mini_chromium to ba9b15f1b6a7 to pick up:
ba9b15f1b6a7 Make bit_cast available in C++11 mode.
R=rsesek@chromium.org
Review URL: https://codereview.chromium.org/583283003
InRangeCast<> is similar to base::saturated_cast<>, but it allows the
caller to specify the value to be returned in the event that the source
value can’t be converted to the destination data type without data loss.
TEST=util_test InRangeCast
R=rsesek@chromium.org
Review URL: https://codereview.chromium.org/467103002
