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If automations are scheduled to start in the future, the slow
automation path is run instead of the fast path where the AudioParam
value is known to be constant.  For most nodes this doesn't matter,
but for BiquadFilters that have a complicated relationship between the
AudioParam values and the filter coefficients, this is a significant
performance hit.

So, if there are no automations scheduled to run in the current render
quantum, we can still use the fast path.

Bug: 795051
Change-Id: Iad144c5ce0bcea4af1921ba879c6c55f210fcb16
Reviewed-on: https://chromium-review.googlesource.com/830033
Commit-Queue: Raymond Toy <rtoy@chromium.org>
Reviewed-by: Hongchan Choi <hongchan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#527041}