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/android/location/LocationProviderInterface.java

@@ -42,6 +42,7 @@ public interface LocationProviderInterface {
     int getStatus(Bundle extras);
     long getStatusUpdateTime();
     void enableLocationTracking(boolean enable);
+    String getInternalState();
     void setMinTime(long minTime);
     void updateNetworkState(int state, NetworkInfo info);
     void updateLocation(Location location);