Make sure to notify divider always

In some cases, recents didn't get resumed, so divider was never
notified and thus we didn't start the animation. Instead, move
the first drawn logic into onStart.

Bug: 28366529
Change-Id: Ia71d6b517451bba727ae31a184bb55cecf5af198

packages/SystemUI/src/com/android/systemui/recents/RecentsActivity.java

@@ -314,6 +314,18 @@ public class RecentsActivity extends Activity implements ViewTreeObserver.OnPreD
         // Notify that recents is now visible
         EventBus.getDefault().send(new RecentsVisibilityChangedEvent(this, true));
         MetricsLogger.visible(this, MetricsEvent.OVERVIEW_ACTIVITY);
+
+        // Notify of the next draw
+        mRecentsView.getViewTreeObserver().addOnPreDrawListener(
+                new ViewTreeObserver.OnPreDrawListener() {
+
+                    @Override
+                    public boolean onPreDraw() {
+                        mRecentsView.getViewTreeObserver().removeOnPreDrawListener(this);
+                        EventBus.getDefault().post(new RecentsDrawnEvent());
+                        return true;
+                    }
+                });
     }
 
     @Override
@@ -399,23 +411,6 @@ public class RecentsActivity extends Activity implements ViewTreeObserver.OnPreD
         EventBus.getDefault().send(new EnterRecentsWindowAnimationCompletedEvent());
     }
 
-    @Override
-    protected void onResume() {
-        super.onResume();
-
-        // Notify of the next draw
-        mRecentsView.getViewTreeObserver().addOnPreDrawListener(
-                new ViewTreeObserver.OnPreDrawListener() {
-
-                    @Override
-                    public boolean onPreDraw() {
-                        mRecentsView.getViewTreeObserver().removeOnPreDrawListener(this);
-                        EventBus.getDefault().post(new RecentsDrawnEvent());
-                        return true;
-                    }
-                });
-    }
-
     @Override
     protected void onPause() {
         super.onPause();