Fix NPE in NavigationBarView during bugreport

Commit "Merge Navigation Bar and Pie Controls button config (1/2)"
changed the tag field on the navigation bar buttons. This was not
reflected in NavigationBarView#dump() method, which lead to a NPE.

Also take into account that back and recents buttons may not be
present in the navigation bar.

Change-Id: Ie590608a4ad27753b673320132af7ec42d7a2ade
Fix ringer mode being unneededly changed by setting ringer mode volume
to 0.

When having set the ringer mode to silent on a device with vibrator and
calling setStreamVolume() for the ringer stream again (e.g. in one of
the volume control dialogs in the settings app), the ringer mode is set
to vibrate, although there's no reason to do so.

Fix that by remembering the last non-normal (that is, either silent or
vibrate) ringer mode and using that when setting the stream volume to 0.

Change-Id: I27f1c75a0fef52bd63ac20f4101042808ce2c458
JIRA: CYAN-1403
Lockscreen : Fix widgets disabled

Currently, when keyguard widgets are disabled via the DevicePolicyManager,
a default widget if specified via widget_default_package_name/widget_default_class_name
is added on the main screen, and if not successful the default status widget is added.

However in its current state, each cycle of the lockscreen alternates between the two widgets.
Reason is, the default app widget is constantly recycled on screen power cycles, and in such events,
when checkAppWidgetConsistency() fails to add the widget (since the id is no longer valid), it toggles
back to the default status widget, and resets the stored id. Next cycle a new id is allocated and it works
and so on ...

This patchset addresses this issue by not removing the default status widget if not necessary, hence
preserving its id and fixing the toggling issue.

Change-Id: I6b21d18346fed5accc72141097939c92ee9aaa3c
Fix mobile data button in power widget.

Change-Id: Ide0417768350081250af24518b6831d70196ba73
JIRA:CYAN-1189
Close notification panel when swiping away the last clearable
notification.

Change-Id: I4e5114f66e799a7c80e18b38abce5678da460846
Hide navigation ring if no targets are configured.

Signed-off-by: Paul Beeler <sparksco@gmail.com>
Derp fix.

Signed-off-by: Paul Beeler <sparksco@gmail.com>
ThemeUtils: Retain the original package name in themed UI context

In order for themes to reflect on system elements, we're changing
their context, including the package name.

This breaks anything that tries to identify system elements,
most notably any users of the uiautomator. Trying to do
'UiSelector().packageName("android")' to find, for example,
a force-close dialog will fail.

Fixes com.android.cts.uiautomatortest.CtsUiAutomatorTest#testUiWatcher

Change-Id: Ic05c3024b20ac3772ed5597846fbfa4a184ebb0d