Add an interface that returns time spent text for app.

Bug: 129266977
Test: robotest
Change-Id: Iaa5b4c5504eccbe0290b1014bd8e25aa3d4c3dd8

src/com/android/settings/applications/ApplicationFeatureProviderImpl.java

@@ -41,7 +41,7 @@ import java.util.Set;
 
 public class ApplicationFeatureProviderImpl implements ApplicationFeatureProvider {
 
-    private final Context mContext;
+    protected final Context mContext;
     private final PackageManager mPm;
     private final IPackageManager mPms;
     private final DevicePolicyManager mDpm;