Support remote Promise in browser

atom/browser/lib/rpc-server.coffee

@@ -50,6 +50,7 @@ unwrapArgs = (sender, args) ->
       when 'remote-object' then objectsRegistry.get meta.id
       when 'array' then unwrapArgs sender, meta.value
       when 'buffer' then new Buffer(meta.value)
+      when 'promise' then Promise.resolve(then: metaToValue(meta.then))
       when 'object'
         ret = v8Util.createObjectWithName meta.name
         for member in meta.members

atom/renderer/api/lib/remote.coffee

@@ -20,6 +20,8 @@ wrapArgs = (args, visited=[]) ->
       type: 'array', value: wrapArgs(value, visited)
     else if Buffer.isBuffer value
       type: 'buffer', value: Array::slice.call(value, 0)
+    else if Promise.resolve(value) == value
+      type: 'promise', then: valueToMeta(value.then.bind(value))
     else if value? and typeof value is 'object' and v8Util.getHiddenValue value, 'atomId'
       type: 'remote-object', id: v8Util.getHiddenValue value, 'atomId'
     else if value? and typeof value is 'object'