Fix CtsAppSecurityHostTestCases test cases

Launch another activity instead of home activity since on targets like
car UI portrait, launching home intent does not make the current
activity go into background.

Bug: 292053153
Test: atest -s 3a5a86ec android.appsecurity.cts.OverlayHostTest#testOverlayEnabled_activityWithServiceInBackground_toForeground android.appsecurity.cts.OverlayHostTest#testOverlayEnabled_activityInBackground_toForeground
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:6f852603be8370d5e10d9346f49fb2dae49fdf01)
Merged-In: I2a0d4804ba943a7ecbd718774250d313f07622ef
Change-Id: I2a0d4804ba943a7ecbd718774250d313f07622ef

Author: rachitjain2706

hostsidetests/appsecurity/test-apps/rro/OverlayTarget/AndroidManifest.xml

@@ -20,6 +20,7 @@
         <uses-library android:name="android.test.runner" />
         <activity android:name=".OverlayTargetActivity" android:exported="false"
                   android:configChanges="@integer/config_changes_assets_paths" />
+        <activity android:name=".SimpleActivity" android:exported="true" />
         <service android:name=".OverlayTargetService" android:exported="false" />
     </application>
 

hostsidetests/appsecurity/test-apps/rro/OverlayTarget/src/com/android/cts/overlay/target/OverlayTargetTest.java

@@ -89,7 +89,7 @@ public void overlayEnabled_activityInForeground() throws Exception {
     public void overlayEnabled_activityInBackground_toForeground() throws Exception {
         final OverlayTargetActivity targetActivity = mActivityTestRule.getActivity();
         // Activity goes into background
-        launchHome();
+        launchSimpleActivity();
         mInstrumentation.waitForIdleSync();
         final CountDownLatch latch = new CountDownLatch(1);
         targetActivity.setConfigurationChangedCallback((activity, config) -> {
@@ -137,9 +137,11 @@ private static void setOverlayEnabled(String overlayPackage, boolean enabled)
                 () -> expected.equals(getStateForOverlay(overlayPackage)));
     }
 
-    private static void launchHome() {
-        SystemUtil.runShellCommand("am start -W -a android.intent.action.MAIN"
-                + " -c android.intent.category.HOME");
+    private void launchSimpleActivity() {
+        Intent intent = new Intent(Intent.ACTION_MAIN);
+        intent.setClass(mInstrumentation.getTargetContext(), SimpleActivity.class);
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        mInstrumentation.startActivitySync(intent);
     }
 
     private static String getStateForOverlay(String overlayPackage) {

hostsidetests/appsecurity/test-apps/rro/OverlayTarget/src/com/android/cts/overlay/target/SimpleActivity.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2023 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.cts.overlay.target;
+
+import android.app.Activity;
+
+/**
+ * Another activity doing nothing
+ */
+public class SimpleActivity extends Activity {
+}