Implement querySiteMapPairs for indexableProvider.

Query sitemap will return a list of pairs [parent class name, child
class name]. It's up to consumer to figure out the display name later
so the provider doesn't have dependency on localizing any display names.

- Removed SiteMapManagerTest. We will perform the test in
  SettingsIntelligence instead.
- Added test for the new provider in instrumentation test (robolectric
  doesn't recognize the new constants in framework yet)

Bug: 67359411
Bug: 64938328
Test: atest
Change-Id: Ia973115320e6b7c8cf84d4756db1763ae7010aed

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

@@ -0,0 +1,62 @@
+/*
+ * 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 static com.google.common.truth.Truth.assertThat;
+
+import android.content.Context;
+import android.database.Cursor;
+import android.net.Uri;
+import android.provider.SearchIndexablesContract;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.filters.SmallTest;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+public class SettingsSearchIndexablesProviderTest {
+
+    private Context mContext;
+
+
+    @Before
+    public void setUp() {
+        mContext = InstrumentationRegistry.getTargetContext();
+    }
+
+    @Test
+    public void testSiteMapPairsFetched() {
+        final Uri uri = Uri.parse("content://" + mContext.getPackageName() + "/" +
+                SearchIndexablesContract.SITE_MAP_PAIRS_PATH);
+        final Cursor cursor = mContext.getContentResolver().query(uri, null, null, null, null);
+
+        final int size = cursor.getCount();
+        assertThat(size).isGreaterThan(0);
+        while (cursor.moveToNext()) {
+            assertThat(cursor.getString(cursor.getColumnIndexOrThrow(
+                    SearchIndexablesContract.SiteMapColumns.PARENT_CLASS)))
+                    .isNotEmpty();
+            assertThat(cursor.getString(cursor.getColumnIndexOrThrow(
+                    SearchIndexablesContract.SiteMapColumns.CHILD_CLASS)))
+                    .isNotEmpty();
+        }
+    }
+}