Resume from time-zero on streaming resources.
Resume from time-zero on streaming resources.

Avoids a lengthy stall while waiting for the file to be recieved
up to the point of the last current time (which may be some time).

May also resolve issues with true streaming resources where the
current time no longer exists.

BUG=none
TEST=none

Review URL: https://codereview.chromium.org/1722783003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#376930}

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