Support for AudioContextOptions latencyHint.

third_party/WebKit/LayoutTests/webaudio/resources/context-properties.js

 // The list of the 'own' properties in various AudioContexts. These lists were
 // populated by running:
 //
 //   Object.getOwnPropertyNames(FooAudioContext.prototype);
 //
 // https://webaudio.github.io/web-audio-api/#BaseAudioContext
 
 
 let BaseAudioContextOwnProperties = [
   'constructor',
@@ skipping 16 matching lines @@
   'createStereoPanner',
   'createWaveShaper',
   'currentTime',
   'decodeAudioData',
   'destination',
   'listener',
   'onstatechange',
   'resume',
   'sampleRate',
   'state',
+  'baseLatency',
 
   // TODO(hongchan): these belong to AudioContext.
   'createMediaElementSource',
   'createMediaStreamDestination',
   'createMediaStreamSource',
 
   // TODO(hongchan): Not implemented yet.
   // 'baseLatency'
 ];
 
@@ skipping 59 matching lines @@
       // The expected property is missing.
       should('The property "' + property + '" was expected but not found.')
           ._testFailed('', false);
     } else if (!result.expected && result.actual) {
       // Something unexpected was found.
       should('The property "' + property + '" was not expected but found.')
           ._testFailed('', false);
     }
   }
 }