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When using the AudioParam value setter, the setter must behave as if
setValueAtTime were called with the given value at the current audio
context time.  This includes throwing an error if the time is in the
middle of a setValueCurveAtTime automation.

This is a change in the old behavior where errors weren't thrown.
This also clarifies the behavior of the value setter when automations
are running.  Previously, the interaction between the setter and
automations were not very well specified.

Bug: 764396
Test: AudioParam/audioparam-value-setter-error.html
Change-Id: Ic1da32c27f9e4f29e2df3bcbb6dd0bd485409e0e
Reviewed-on: https://chromium-review.googlesource.com/665318
Commit-Queue: Raymond Toy <rtoy@chromium.org>
Reviewed-by: Hongchan Choi <hongchan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534737}