Fix ListView is not scrolled properly with arrows

According to ListView's layoutChildren logic, it detaches all children
and rebuilds its children based on visible area which might omit
invisible elements in the adapter.

In this case, arrowScroll methods only tries to find next scroll
candidates from its children so user is unable to scroll more with
D-pad.

This fixes the issue by look forward next child among the adapter as
well as children.

Bug: 7346868
Change-Id: I01ab19ad899b5bcb5ab420ddf08c9ffd136933d1
TextToSpeech memory leak

The callback object needs to be out of the class so that it won't
get a strong reference on the TextToSpeech object because it leads
to a memory leak due to the fact that the callback's lifecycle is
linked to the server and not to the TextToSpeech and then, keeps it
from being GCed.

Change-Id: I9cd5c7726d7cf2f60d6e25cc5caa87ad825e8f83
Author: Jean-Christophe PINCE <jean-christophe.pince@intel.com>
Signed-off-by: Jean-Christophe PINCE <jean-christophe.pince@intel.com>
Signed-off-by: Shuo Gao <shuo.gao@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 57869