Add ProcessTask.

src/stdlib/process-task-shell.coffee

@@ -0,0 +1,37 @@
+global.window = {}
+global.attachEvent = ->
+console =
+  warn: -> callTaskMethod 'warn', arguments...
+  log: -> callTaskMethod 'log', arguments...
+  error: -> callTaskMethod 'error', arguments...
+global.__defineGetter__ 'console', -> console
+
+window.document =
+  createElement: ->
+    setAttribute: ->
+    getElementsByTagName: -> []
+    appendChild: ->
+  documentElement:
+    insertBefore: ->
+    removeChild: ->
+  getElementById: -> {}
+  createComment: -> {}
+  createDocumentFragment: -> {}
+global.document = window.document
+
+# `callTaskMethod` can be used to invoke method's on the parent `Task` object
+# back in the window thread.
+global.callTaskMethod = (method, args...) ->
+  process.send(method: method, args: args)
+
+# The worker's initial handler replaces itglobal when `start` is invoked
+global.handler =
+  start: ({globals, handlerPath}) ->
+    for key, value of globals
+      global[key] = value
+      window[key] = value
+    global.handler = require(handlerPath)
+    callTaskMethod 'started'
+
+process.on 'message', (data) ->
+  handler[data.method]?(data.args...) if data.method