Fix possible NPE in SyncHandler.onBootCompleted()

If onBootCompleted() was called a second time, it would have throw a
NullPointerException since the queue object would have already been
set to null by the previous call. This commit just makes such an
object behave as an empty queue instead of throwing the exception.

Change-Id: I7ef82ba1e2504ceb0a2c11694d32f0588db7d0af
quiethours: do not play screenshot sound

If we are in quiet hours do not play any sound when we take a screenshot.

Change-Id: Ideaa5c11611b7e3c9d6ca4d27e801cd2fb4eadac
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
improve a calculation method for LTE antenna reception level

This proposal will fix a problem that Android devices could
show different levels of antenna bars under the same radio
environment if each device uses different modem.
This behavior makes confusion toward users and others.

That behavior comes from using RSSNR as a metric for
determining antenna bars. Unfortunately, RSSNR does NOT define
performance requirements and error tolerance level in 3GPP.
Therefore, accuracy of RSSNR measurement could be inconsistent
among Android devices or modems.

The patch we would like to contribute here will be offering
Android device to use RSRQ for antenna bar metric instead of RSSNR.

1.)RSRQ, like RSSNR, takes interference into account
   when measuring the radio quality.
   Android already supports measurement of RSRQ.

2.)The performance requirement for RSRQ is already defined in 3GPP.

3.)DOCOMO and other many mobile operators use RSRP and RSRQ
   when designing LTE coverage areas, and alignment here will
   be very beneficial for both users and operators.

Hope this patch helps to improve Android antenna bar accuracy and consistency today.

Change-Id: Id1c3339764294ef51365ab133a1c7b42e14e1800
Signed-off-by: Kensuke Ueda <uedake@nttdocomo.co.jp>

Conflicts:
	core/res/res/values/config.xml

Conflicts:
	core/res/res/values/symbols.xml
Base: make touchslop configurable [2/2]

Change-Id: I6c6be8d9308d7046c21d03407d0efd3609f67560
Signed-off-by: bart452 <bart4524@gmail.com>

Conflicts:
	core/java/android/provider/Settings.java