location: dump LocationProvider internal state

For each location provider, call getInternalState() to see if it has any
state information to include in a bugreport. If the returned string is not
null, then print a header with the provided name followed by the returned
string.

Change-Id: I0a388d7fba14ac8cadcb80eda0a0ceb95032410b
Signed-off-by: Fred Fettinger <fred.fettinger@motorola.com>
Signed-off-by: Mike Lockwood <lockwood@android.com>

location/java/com/android/internal/location/PassiveProvider.java

@@ -106,6 +106,10 @@ public class PassiveProvider implements LocationProviderInterface {
         return -1;
     }
 
+    public String getInternalState() {
+        return null;
+    }
+
     public void enableLocationTracking(boolean enable) {
         mTracking = enable;
     }