Introduce condition provider services.

Add the condition provider interface, base class, and associated
system metadata.

Pull out common service management code into a reusable helper,
used by notification listeners and condition providers. The
helper, ManagedServices, is now completely self-contained - it
has no dependencies on NoMan or NoMan abstractions.

Bug:13743109
Change-Id: I6856d40f0a2ead78ac9b5707568559a57e7eb009
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index 57e845f..ecb0295 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -2620,6 +2620,15 @@
         android:description="@string/permdesc_bindNotificationListenerService"
         android:protectionLevel="signature" />
 
+    <!-- Must be required by an {@link
+         android.service.notification.ConditionProviderService},
+         to ensure that only the system can bind to it.
+         @hide -->
+    <permission android:name="android.permission.BIND_CONDITION_PROVIDER_SERVICE"
+        android:label="@string/permlab_bindConditionProviderService"
+        android:description="@string/permdesc_bindConditionProviderService"
+        android:protectionLevel="signature" />
+
     <!-- Allows an application to call into a carrier setup flow. It is up to the
          carrier setup application to enforce that this permission is required
          @hide This is not a third-party API (intended for OEMs and system apps). -->