Fix some synchronization issues in BatteryService.

Some of the BatteryService state was being locked
sometimes and it wasn't at all consistent.

Bug: 7158734
Change-Id: I46e75f66fde92c5a577a80a6bd99c9573066f3c1

Author: Jeff Brown

core/java/android/os/BatteryManager.java

@@ -117,4 +117,8 @@ public class BatteryManager {
     public static final int BATTERY_PLUGGED_USB = 2;
     /** Power source is wireless. */
     public static final int BATTERY_PLUGGED_WIRELESS = 4;
+
+    /** @hide */
+    public static final int BATTERY_PLUGGED_ANY =
+            BATTERY_PLUGGED_AC | BATTERY_PLUGGED_USB | BATTERY_PLUGGED_WIRELESS;
 }