Add promise-based addIceCandidate, setLocalDescription and setRemoteDescription to RTCPeerConnection

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 1227 matching lines @@
       'mediastream/RTCSessionDescriptionRequestImpl.cpp',
       'mediastream/RTCSessionDescriptionRequestImpl.h',
       'mediastream/RTCStatsReport.cpp',
       'mediastream/RTCStatsReport.h',
       'mediastream/RTCStatsRequestImpl.cpp',
       'mediastream/RTCStatsRequestImpl.h',
       'mediastream/RTCStatsResponse.cpp',
       'mediastream/RTCStatsResponse.h',
       'mediastream/RTCVoidRequestImpl.cpp',
       'mediastream/RTCVoidRequestImpl.h',
+      'mediastream/RTCVoidRequestPromiseImpl.cpp',
+      'mediastream/RTCVoidRequestPromiseImpl.h',
       'mediastream/SourceInfo.cpp',
       'mediastream/SourceInfo.h',
       'mediastream/URLMediaStream.cpp',
       'mediastream/URLMediaStream.h',
       'mediastream/UserMediaClient.h',
       'mediastream/UserMediaController.cpp',
       'mediastream/UserMediaController.h',
       'mediastream/UserMediaRequest.cpp',
       'mediastream/UserMediaRequest.h',
       'navigatorconnect/AcceptConnectionObserver.cpp',
@@ skipping 673 matching lines @@
       'webaudio/AudioBasicProcessorHandlerTest.cpp',
       'webaudio/ConvolverNodeTest.cpp',
       'webaudio/DynamicsCompressorNodeTest.cpp',
       'webaudio/ScriptProcessorNodeTest.cpp',
       'webaudio/StereoPannerNodeTest.cpp',
       'websockets/DOMWebSocketTest.cpp',
       'websockets/DocumentWebSocketChannelTest.cpp',
     ],
   },
 }