Fixing Robolectic model tests

Some tests were broken because of refactoring in LauncherModel.

Change-Id: I55aa32d75a4d16338796a1b1765717fd72ba4b33

quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java

@@ -326,6 +326,8 @@ public abstract class BaseQuickstepLauncher extends Launcher
     @Override
     public void onAttachedToWindow() {
         super.onAttachedToWindow();
-        InteractionJankMonitorWrapper.init(getWindow().getDecorView());
+        if (Utilities.ATLEAST_R) {
+            InteractionJankMonitorWrapper.init(getWindow().getDecorView());
+        }
     }
 }