Android: added a webview based example application

Change-Id: Iec2b690424e027738b4e6ad5f712575dd4381c85
Android: added a native example application which shows a self-view

Change-Id: Ic718a2b1270fe55b814e43b3e5e735a290f40843
Android: added a hybrid example application that uses overlay rendering

Change-Id: I5682cc41ea39d33c64333e2f9019fd2f02ee2f69