Set parent activity for search.

This enables the nav up button from actionbar.

Fix: 34176247
Test:  runtest --path packages/apps/Settings/tests/unit/src/com/android/settings/search/SearchActivityTest.java

Change-Id: I28ef9f1270f5a178346ff9bd9148f7f2035858b2

tests/unit/src/com/android/settings/search/SearchActivityTest.java

@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2017 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.settings.search;
+
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.filters.SmallTest;
+import android.support.test.runner.AndroidJUnit4;
+
+import com.android.settings.Settings;
+import com.android.settings.search2.SearchActivity;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+
+@SmallTest
+@RunWith(AndroidJUnit4.class)
+public class SearchActivityTest {
+
+    @Test
+    public void shouldHaveParentActivity() {
+        final Context context = InstrumentationRegistry.getTargetContext();
+        final PackageManager packageManager = context.getPackageManager();
+        final Intent intent = new Intent(context, SearchActivity.class);
+        final List<ResolveInfo> resolveInfos = packageManager.queryIntentActivities(
+                intent, PackageManager.GET_META_DATA);
+
+        assertFalse(resolveInfos.isEmpty());
+        assertEquals(Settings.class.getName(), resolveInfos.get(0).activityInfo.parentActivityName);
+    }
+}