Control access to inherited methods of jsinterface objects

Bug: 7073422

Create the plumbing to use an annotation to allow access to
inherited methods of jsinterface objects. The default webview
behavior has not changed yet. However internally an a flag is
introduced to restrict javascript access to methods that have an annotation.

Change-Id: I41927248e6bc4b09d17c0707c60fe5e6ab681e66