AI 143616: Fix ANR that could occur when disabling GPS in Settings while the GPS is active.

Exit from GpsEventThread immediately when the GPS is disabled instead of
  waiting for the GPS to shut down fully.
  BUG=1729031

Automated import of CL 143616

location/java/com/android/internal/location/GpsLocationProvider.java

@@ -412,6 +412,12 @@ public class GpsLocationProvider extends LocationProviderImpl {
             mNetworkThread = null;
         }
 
+        // The GpsEventThread does not wait for the GPS to shutdown
+        // so we need to report the GPS_STATUS_ENGINE_OFF event here
+        if (mNavigating) {
+            reportStatus(GPS_STATUS_ENGINE_OFF);
+        }
+
         native_cleanup();
     }
 
@@ -797,8 +803,8 @@ public class GpsLocationProvider extends LocationProviderImpl {
 
         public void run() {
             if (Config.LOGD) Log.d(TAG, "GpsEventThread starting");
-            // thread exits after disable() is called and navigation has stopped
-            while (mEnabled || mNavigating) {
+            // Exit as soon as disable() is called instead of waiting for the GPS to stop.
+            while (mEnabled) {
                 // this will wait for an event from the GPS,
                 // which will be reported via reportLocation or reportStatus
                 native_wait_for_event();