https://bugs.webkit.org/show_bug.cgi?id=97369

Reviewed by Kenneth Russell.

BiquadFilterNode is currently ignoring any timeline or audio-rate changes to its parameters.
We now check if any of its parameters have timeline or audio-rate changes and, if so, take
them into account.  Otherwise, we use ordinary parameter smoothing/de-zippering which is
the case when the parameters are adjusted, for example, from a knob or slider in the UI.

* Modules/webaudio/BiquadDSPKernel.cpp:
(WebCore::BiquadDSPKernel::updateCoefficientsIfNecessary):
* Modules/webaudio/BiquadProcessor.cpp:
(WebCore::BiquadProcessor::checkForDirtyCoefficients):
* Modules/webaudio/BiquadProcessor.h:
(WebCore::BiquadProcessor::hasSampleAccurateValues):
(BiquadProcessor):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@129277 268f45cc-cd09-0410-ab3c-d52691b4dbfc