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Turns out dropping the time argument in 08602875 doesn't work well in a
video frame scheduling based world as a VideoRenderer is no longer
able to poll for the current time. Instead, go back to passing in the
start timestamp so that VideoRenderer implementations can do frame
accurate seeking.

BUG=110814,370634

Review URL: https://codereview.chromium.org/568113003

Cr-Commit-Position: refs/heads/master@{#295002}