Add SourceBuffer implementations of Audio/VideoTracks

third_party/WebKit/Source/modules/modules.gypi

 {
   'includes': [
     '../core/core_generated.gypi',
     'modules_generated.gypi',
   ],
   'variables': {
     # Experimental hooks for embedder to provide extra IDL and source files.
     #
     # Note: this is not a supported API. If you rely on this, you will be broken
     # from time to time as the code generator changes in backward incompatible
@@ skipping 342 matching lines @@
       'gamepad/NavigatorGamepad.idl',
       'geofencing/ServiceWorkerGlobalScopeGeofencing.idl',
       'geofencing/ServiceWorkerRegistrationGeofencing.idl',
       'geofencing/WorkerNavigatorGeofencing.idl',
       'geolocation/NavigatorGeolocation.idl',
       'indexeddb/WindowIndexedDatabase.idl',
       'indexeddb/WorkerGlobalScopeIndexedDatabase.idl',
       'mediacapturefromelement/HTMLCanvasElementCapture.idl',
       'mediacapturefromelement/HTMLMediaElementCapture.idl',
       'mediasession/HTMLMediaElementMediaSession.idl',
+      'mediasource/AudioTrack.idl',
+      'mediasource/VideoTrack.idl',
       'mediasource/HTMLVideoElementMediaSource.idl',
       'mediasource/URLMediaSource.idl',
       'mediastream/NavigatorMediaStream.idl',
       'mediastream/NavigatorUserMedia.idl',
       'mediastream/URLMediaStream.idl',
       'mediastream/WindowMediaStream.idl',
       'navigatorconnect/NavigatorServices.idl',
       'navigatorconnect/ServiceWorkerGlobalScopeNavigatorConnect.idl',
       'navigatorconnect/WorkerNavigatorServices.idl',
       'navigatorcontentutils/NavigatorContentUtils.idl',
@@ skipping 794 matching lines @@
       'mediasession/MediaSessionError.cpp',
       'mediasession/MediaSessionError.h',
       'mediasource/HTMLVideoElementMediaSource.cpp',
       'mediasource/HTMLVideoElementMediaSource.h',
       'mediasource/MediaSource.cpp',
       'mediasource/MediaSource.h',
       'mediasource/MediaSourceRegistry.cpp',
       'mediasource/MediaSourceRegistry.h',
       'mediasource/SourceBuffer.cpp',
       'mediasource/SourceBuffer.h',
+      'mediasource/SourceBufferAudioTrack.cpp',
+      'mediasource/SourceBufferAudioTrack.h',
       'mediasource/SourceBufferList.cpp',
       'mediasource/SourceBufferList.h',
+      'mediasource/SourceBufferVideoTrack.cpp',
+      'mediasource/SourceBufferVideoTrack.h',
       'mediasource/TrackDefault.cpp',
       'mediasource/TrackDefault.h',
       'mediasource/TrackDefaultList.cpp',
       'mediasource/TrackDefaultList.h',
       'mediasource/URLMediaSource.cpp',
       'mediasource/URLMediaSource.h',
       'mediasource/VideoPlaybackQuality.cpp',
       'mediasource/VideoPlaybackQuality.h',
       'mediastream/MediaConstraintsImpl.cpp',
       'mediastream/MediaConstraintsImpl.h',
@@ skipping 744 matching lines @@
       'webaudio/AudioBasicProcessorHandlerTest.cpp',
       'webaudio/ConvolverNodeTest.cpp',
       'webaudio/DynamicsCompressorNodeTest.cpp',
       'webaudio/ScriptProcessorNodeTest.cpp',
       'webaudio/StereoPannerNodeTest.cpp',
       'websockets/DOMWebSocketTest.cpp',
       'websockets/DocumentWebSocketChannelTest.cpp',
     ],
   },
 }