ossu a280f7c026 Added integer parsing functions in base/string_to_number.h
They provide parsing of numbers from char* and std::string into any of
the fundamental integer types. Values are returned
in an rtc::Optional, which is left empty if parsing was unsuccessful.

BUG=webrtc:5806

Review-Url: https://codereview.webrtc.org/2696003004
Cr-Commit-Position: refs/heads/master@{#17557}
2017-04-06 09:02:15 +00:00
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