b1ac203480
Seconds and fractions parts of the ntp time presented with two values, but used as one. This helper structure can make that use more clear. (initially introduced into rtp_rtcp as https://codereview.webrtc.org/1435833003) BUG=webrtc:5260 Review URL: https://codereview.webrtc.org/1482593002 Cr-Commit-Position: refs/heads/master@{#10814}