API CHANGE: startDrag() now takes "int flags" instead of "boolean localOnly"

startDrag() that crosses application boundaries will remain @hide until we get
more of the surrounding behaviors nailed down.

Drag-and-drop demo updated to only show app-local drag operations pro tem.

Change-Id: I9cdcd132c1aae45bc472e70293b7187b4cba9bca
4 files changed