Add Game settings support.

Add Game settings page under Apps so that users can access game related
features and toggle settings.

Bug: b/185822999
Test: make ROBOTEST_FILTER=GameSettingsPreferenceControllerTest RunSettingsRoboTests
Change-Id: I923ba70536b7f68b5330a508b8dabf27e33f4c55

tests/unit/src/com/android/settings/testutils/FakeFeatureFactory.java

@@ -21,6 +21,7 @@ import android.content.Context;
 
 import com.android.settings.accounts.AccountFeatureProvider;
 import com.android.settings.applications.ApplicationFeatureProvider;
+import com.android.settings.applications.GameSettingsFeatureProvider;
 import com.android.settings.applications.appinfo.ExtraAppInfoFeatureProvider;
 import com.android.settings.aware.AwareFeatureProvider;
 import com.android.settings.biometrics.face.FaceFeatureProvider;
@@ -80,6 +81,7 @@ public class FakeFeatureFactory extends FeatureFactory {
     public WifiTrackerLibProvider wifiTrackerLibProvider;
     public ExtraAppInfoFeatureProvider extraAppInfoFeatureProvider;
     public SecuritySettingsFeatureProvider securitySettingsFeatureProvider;
+    public GameSettingsFeatureProvider gameSettingsFeatureProvider;
 
     /**
      * Call this in {@code @Before} method of the test class to use fake factory.
@@ -119,6 +121,7 @@ public class FakeFeatureFactory extends FeatureFactory {
         wifiTrackerLibProvider = mock(WifiTrackerLibProvider.class);
         extraAppInfoFeatureProvider = mock(ExtraAppInfoFeatureProvider.class);
         securitySettingsFeatureProvider = mock(SecuritySettingsFeatureProvider.class);
+        gameSettingsFeatureProvider = mock(GameSettingsFeatureProvider.class);
     }
 
     @Override
@@ -250,4 +253,9 @@ public class FakeFeatureFactory extends FeatureFactory {
     public SecuritySettingsFeatureProvider getSecuritySettingsFeatureProvider() {
         return securitySettingsFeatureProvider;
     }
+
+    @Override
+    public GameSettingsFeatureProvider getGameSettingsFeatureProvider() {
+        return gameSettingsFeatureProvider;
+    }
 }