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Implements the core part of overload resolution.

Bug: 839389
Change-Id: If1281a7df2f4adf08968f6b361c5d43ef5999a87
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906453Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719534}