WebAudio: Add BaseAudioContext

Category: Multimedia
Type: New or changed feature
Status: Enabled by default (Chrome 55)
Intent stage: None

Summary

Implement BaseAudioContext according to the spec. This introduces a trivial but user-visible change: querying `AudioContext.prototype.hasOwnProperty(functionName)` will fail. See the comment to see how to fix the potential issue.

Standards & signals

Specification: http://webaudio.github.io/web-audio-api/
Firefox: Positive
Safari: No signal
Web developers: No signals
Tracking bug: https://crbug.com/555608

Docs: https://webaudio.github.io/web-audio-api/#BaseAudioContext https://developer.mozilla.org/en-US/docs/Web/API/AudioContext

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