Open links settings

These changes show the list of applications that handle domain links in
the "Opening links" setting. Currently it only shows a summary of the
links that can be opened. These preferences will redirect to an
application specific settings page in subsequent changes.

Bug: 130735722
Test: manual and robolectric
Change-Id: Ia94e71044efcb4645c1eeda208a17c89653bef21
diff --git a/tests/robotests/src/com/android/car/settings/testutils/ShadowApplicationsState.java b/tests/robotests/src/com/android/car/settings/testutils/ShadowApplicationsState.java
new file mode 100644
index 0000000..383a245
--- /dev/null
+++ b/tests/robotests/src/com/android/car/settings/testutils/ShadowApplicationsState.java
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.car.settings.testutils;
+
+import android.app.Application;
+
+import com.android.settingslib.applications.ApplicationsState;
+
+import org.robolectric.annotation.Implementation;
+import org.robolectric.annotation.Implements;
+import org.robolectric.annotation.Resetter;
+
+@Implements(ApplicationsState.class)
+public class ShadowApplicationsState {
+
+    private static ApplicationsState sApplicationsState;
+
+    public static void setInstance(ApplicationsState applicationsState) {
+        sApplicationsState = applicationsState;
+    }
+
+    @Resetter
+    public static void reset() {
+        sApplicationsState = null;
+    }
+
+    @Implementation
+    protected static ApplicationsState getInstance(Application app) {
+        return sApplicationsState;
+    }
+}