Force update wifi QS when opening.

This changes expands on ag/2608526 by forcing a refresh of AccessPoints
when the QuickSettings picker is opened. This consolidates logic between
QS and Settings, where in WifiSettings we forceUpdate on cold start.

Bug: b/62680006
Test: 1. Open the quick settings picker
2. Minimize the picker
3. Walk out of range of the networks you say listed in the picker
4. Re-open picker
5. Stale networks should not be shown, latest scan results should be.

Change-Id: Ia944dd3dbeff7d9c3774f04129c07f1ffd4466b2

packages/SystemUI/src/com/android/systemui/qs/tiles/WifiTile.java

@@ -311,12 +311,10 @@ public class WifiTile extends QSTileImpl<SignalState> {
         public View createDetailView(Context context, View convertView, ViewGroup parent) {
             if (DEBUG) Log.d(TAG, "createDetailView convertView=" + (convertView != null));
             mAccessPoints = null;
-            mWifiController.scanForAccessPoints();
-            fireScanStateChanged(true);
             mItems = QSDetailItems.convertOrInflate(context, convertView, parent);
             mItems.setTagSuffix("Wifi");
             mItems.setCallback(this);
-            updateItems();
+            mWifiController.scanForAccessPoints(); // updates APs and items
             setItemsVisible(mState.value);
             return mItems;
         }

packages/SystemUI/src/com/android/systemui/statusbar/policy/AccessPointControllerImpl.java

@@ -97,8 +97,9 @@ public class AccessPointControllerImpl
 
     @Override
     public void scanForAccessPoints() {
-        if (DEBUG) Log.d(TAG, "scan!");
-        mWifiTracker.forceScan();
+        if (DEBUG) Log.d(TAG, "force update APs!");
+        mWifiTracker.forceUpdate();
+        fireAcccessPointsCallback(mWifiTracker.getAccessPoints());
     }
 
     @Override