Chromium

• Changed: WebAudio: Add ConstantSourceNode

  Status	In development	→	Enabled by default
  Android	(n/a)	→	56
  Desktop	(n/a)	→	56
  Ios	(n/a)	→	56
  ShippedMilestone	(n/a)	→	56
  ShippedOperaAndroidMilestone	(n/a)	→	43
  ShippedOperaMilestone	(n/a)	→	43
  ShippedWebViewMilestone	(n/a)	→	56

• Changed: WebAudio: ChannelSplitterNode channelCount and channelCountMode are constant

  Status	In development	→	Enabled by default
  Android	(n/a)	→	56
  Desktop	(n/a)	→	56
  Ios	(n/a)	→	56
  ShippedMilestone	(n/a)	→	56
  ShippedOperaAndroidMilestone	(n/a)	→	43
  ShippedOperaMilestone	(n/a)	→	43
  ShippedWebViewMilestone	(n/a)	→	56

• Changed: WebAudio: PannerNode.rolloffFactor clamps to nominal range.

  Status	In development	→	Enabled by default
  Android	(n/a)	→	56
  Desktop	(n/a)	→	56
  Ios	(n/a)	→	56
  ShippedMilestone	(n/a)	→	56
  ShippedOperaAndroidMilestone	(n/a)	→	43
  ShippedOperaMilestone	(n/a)	→	43
  ShippedWebViewMilestone	(n/a)	→	56

• Added: Passive Touch Event Listeners During Fling Intervention

  Status	Behind a flag