Chrome: Plugin Architecture

http://dev.chromium.org/developers/design-documents/plugin-architecture

Call Proxy will encode to IPC, then decode the IPC to call Stub.
The WebPluginDelegate is just the implementation of WebPlugin.(Abstraction)

From Renderer to Plugin:
WebPluginDelegateProxy -> IPC -> WebPluginDelegateStub
From Plugin to Renderer:
WebPluginProxy -> IPC -> WebPluginStub