Class com.google.common.util.concurrent.AbstractFuture

Added Methods
Throwable newCancellationCause()	Returns an exception to be used as the cause of the CancellationException thrown by .get.
boolean setFuture(ListenableFuture<? extends V>)	Sets the result of this {@code Future} to match the supplied input {@code Future} once the supplied {@code Future} is done, unless this {@code Future} has already been cancelled or set (including "set asynchronously," defined below).