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The automation functions exponentialRampToValueAtTime,
setTargetAtTime, and setValueCurveAtTime were not correctly updating
the .value attribute of the AudioParam.  For the first two methods,
the computed value was one frame too far into the future.  For last
method, the return value was always the last curve element, which is
wrong.

BUG=574905
TEST=audioparam-update-value-attribute.html

Review URL: https://codereview.chromium.org/1695573002

Cr-Commit-Position: refs/heads/master@{#376044}