Add wifi "HANGED" driver state triggering reload.

The driver can now report to us that they are hosed and we'll shut
down wifi and restart it - only to be used as a last resort.

Also fixing synch problem with updateWifiState.

bug: 2173119

services/java/com/android/server/WifiService.java

@@ -142,6 +142,7 @@ public class WifiService extends IWifiManager.Stub {
     private static final int MESSAGE_STOP_WIFI        = 2;
     private static final int MESSAGE_START_WIFI       = 3;
     private static final int MESSAGE_RELEASE_WAKELOCK = 4;
+    private static final int MESSAGE_UPDATE_STATE     = 5;
 
     private final  WifiHandler mWifiHandler;
 
@@ -1446,6 +1447,11 @@ public class WifiService extends IWifiManager.Stub {
     }
 
     private void updateWifiState() {
+        // send a message so it's all serialized
+        Message.obtain(mWifiHandler, MESSAGE_UPDATE_STATE, 0, 0).sendToTarget();
+    }
+
+    private void doUpdateWifiState() {
         boolean wifiEnabled = getPersistedWifiEnabled();
         boolean airplaneMode = isAirplaneModeOn() && !mAirplaneModeOverwridden;
         boolean lockHeld = mLocks.hasLocks();
@@ -1551,6 +1557,10 @@ public class WifiService extends IWifiManager.Stub {
                     sWakeLock.release();
                     break;
 
+                case MESSAGE_UPDATE_STATE:
+                    doUpdateWifiState();
+                    break;
+
                 case MESSAGE_DISABLE_WIFI:
                     // a non-zero msg.arg1 value means the "enabled" setting
                     // should be persisted