Do not expose wifi slice when no permission

Prior to this cl, slice provider always exposes wifi slice
to calling package without confirming any wifi permissions.

For current solution, we will check calling package's permission state
and decide whether slice provider should expose wifi slice or not.

Because settings search is a part of settings app,
this permission checker won't be applied to settings intelligence.

Test: manual, robotest, cts
Also run manul
Bug: 178014725

Change-Id: I2770b5b43366a5aa65c7519efc4243d350a21b26

tests/robotests/src/com/android/settings/testutils/shadow/ShadowWifiSlice.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2022 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.testutils.shadow;
+
+import android.content.Context;
+
+import com.android.settings.wifi.slice.WifiSlice;
+
+import org.robolectric.annotation.Implementation;
+import org.robolectric.annotation.Implements;
+
+@Implements(WifiSlice.class)
+public class ShadowWifiSlice {
+
+    private static boolean sIsWifiPermissible;
+
+    @Implementation
+    protected static boolean isPermissionGranted(Context settingsContext) {
+        return sIsWifiPermissible;
+    }
+
+    public static void setWifiPermissible(boolean isWifiPermissible) {
+        sIsWifiPermissible = isWifiPermissible;
+    }
+}