Setup flags for windowing sdk

Fix: 291681490
Bug: 260873529
Test: atest FrameworksCoreTests:WindowFlagsTest
Change-Id: I7d978b3d4e258ff54d31f6bb6d2f1279574cb742

AconfigFlags.bp

@@ -19,6 +19,7 @@ java_defaults {
     // Add java_aconfig_libraries to here to add them to the core framework
     srcs: [
         ":com.android.hardware.camera2-aconfig-java{.generated_srcjars}",
+        ":com.android.window.flags.window-aconfig-java{.generated_srcjars}",
     ],
 }
 
@@ -30,6 +31,7 @@ java_defaults {
     libs: ["fake_device_config"],
 }
 
+// Camera
 aconfig_declarations {
     name: "com.android.hardware.camera2-aconfig",
     package: "com.android.hardware.camera2",
@@ -41,3 +43,16 @@ java_aconfig_library {
     aconfig_declarations: "com.android.hardware.camera2-aconfig",
     defaults: ["framework-minus-apex-aconfig-java-defaults"],
 }
+
+// Window
+aconfig_declarations {
+    name: "com.android.window.flags.window-aconfig",
+    package: "com.android.window.flags",
+    srcs: ["core/java/android/window/flags/*.aconfig"],
+}
+
+java_aconfig_library {
+    name: "com.android.window.flags.window-aconfig-java",
+    aconfig_declarations: "com.android.window.flags.window-aconfig",
+    defaults: ["framework-minus-apex-aconfig-java-defaults"],
+}

core/java/android/window/flags/windowing_sdk.aconfig

+package: "com.android.window.flags"
+
+# Project link: https://gantry.corp.google.com/projects/android_platform_windowing_sdk/changes
+
+flag {
+    namespace: "windowing_sdk"
+    name: "sync_window_config_update_flag"
+    description: "Whether the feature to sync different window-related config updates is enabled"
+    bug: "260873529"
+}

core/tests/coretests/src/android/window/flags/WindowFlagsTest.java

+/*
+ * 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 android.window.flags;
+
+import static com.android.window.flags.Flags.syncWindowConfigUpdateFlag;
+
+import android.platform.test.annotations.Presubmit;
+
+import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+/**
+ * Tests for {@link com.android.window.flags.Flags}
+ *
+ * Build/Install/Run:
+ *  atest FrameworksCoreTests:WindowFlagsTest
+ */
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+@Presubmit
+public class WindowFlagsTest {
+
+    @Test
+    public void testSyncWindowConfigUpdateFlag() {
+        // No crash when accessing the flag.
+        syncWindowConfigUpdateFlag();
+    }
+}