Move all sources under atom/.

atom/common/api/lib/callbacks-registry.coffee

@@ -0,0 +1,25 @@
+module.exports =
+class CallbacksRegistry
+  constructor: ->
+    @emptyFunc = -> throw new Error "Browser trying to call a non-exist callback
+      in renderer, this usually happens when renderer code forgot to release
+      a callback installed on objects in browser when renderer was going to be
+      unloaded or released."
+    @callbacks = {}
+
+  add: (callback) ->
+    id = Math.random().toString()
+    @callbacks[id] = callback
+    id
+
+  get: (id) ->
+    @callbacks[id] ? ->
+
+  call: (id, args...) ->
+    @get(id).call global, args...
+
+  apply: (id, args...) ->
+    @get(id).apply global, args...
+
+  remove: (id) ->
+    delete @callbacks[id]