When the static buffer has just been invalidated we stream from the buffer
directly for some time. This streaming forgot to offset the starting
point, causing a bug.

BUG=510585

Change-Id: I8321e462841eb0bd7ed97ab78197914cbdb68c55
Reviewed-on: https://chromium-review.googlesource.com/287525Reviewed-by: Hendrik Wagenaar <hendrikw@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>