Convert seconds_since_epoch to integer.
Convert seconds_since_epoch to integer.

It looks like the 400 errors when trying to upload to test-results.appspot.com is because the server expects an integer instead of a float.

BUG=chromium:325726
TBR=kjellander@webrtc.org, kwiberg@webrtc.org, pbos@webrtc.org
NOTRY=True

Review-Url: https://codereview.webrtc.org/2566603003
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#15504}

ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc