AudioService: Fix absolute volume for AVRCP

Avrcp.java uses max volume obtained by getStreamMaxVolume() when
converting to AVRCP levels and it returns non-scaled volume index.
For this reason volume index needs to be dispatched to Avrcp before
scaling as otherwise Avrcp will convert volume level incorrectly,
i.e. max volume index for music stream is 15 and any volume index
>1 (>10 after scaling) will result in setting *MAXIMUM* volume level
on headset which is not safe for listener.

Change-Id: Ia799eec578ed2326ec18b69f2ee4f2a60c664514
Volumes in Settings/Sound is slow to start

There is a delay after pressing volume menu item
there is a delay until the Volume popup is shown.

The reason for this is that the initialization of
the different seekbars is slow and run in the main
thread. More specifically the call to get the
ringtone from the RingtoneManager is causing this
delay.

Moving the call to the ringtone manager to the
handler thread used to play ringtones to make
the launch of the volume dialog a bit snappier.

Change-Id: I76da0226592468debd542d67164b37b2b59897c7
Fix setSurfaceTexture to handle surface caching

Changed the TextureView.setSurfaceTexture to apply the
existing listener to the surface provided in the method.
This is done to allow surface caching to work.
Whenever a new SurfaceTexture gets created, its listener is
created as well, so when the setSurfaceTexture is called
we should be attaching the listener to the new surface.

Change-Id: I4c1a704c587e977ab7a6b1fe3a7d3e0d20d00218
CRs-Fixed: 639136
Merge "Fix setSurfaceTexture to handle surface caching" into kitkat
Merge "Volumes in Settings/Sound is slow to start" into kitkat
Merge "AudioService: Fix absolute volume for AVRCP" into kitkat