Aconfig flag for notif icon container refactor

Bug: 290787599
Bug: 278765923
Test: make
Change-Id: If44810377604f48c1f2e6c4a41877cdfeb278701
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index 0567528..c26d5f5 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -23,6 +23,14 @@
 }
 
 flag {
+    name: "notifications_icon_container_refactor"
+    namespace: "systemui"
+    description: "Enables the refactored version of the notification icon container in StatusBar, "
+        "AOD, and the notification shelf. Should not bring any behavioral changes."
+    bug: "278765923"
+}
+
+flag {
     name: "notification_lifetime_extension_refactor"
     namespace: "systemui"
     description: "Enables moving notification lifetime extension management from SystemUI to "
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/shared/NotificationIconContainerRefactor.kt b/packages/SystemUI/src/com/android/systemui/statusbar/notification/shared/NotificationIconContainerRefactor.kt
new file mode 100644
index 0000000..dee609c
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/shared/NotificationIconContainerRefactor.kt
@@ -0,0 +1,46 @@
+/*
+ * 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.systemui.statusbar.notification.shared
+
+import com.android.systemui.Flags
+import com.android.systemui.flags.RefactorFlagUtils
+
+/** Helper for reading or using the NotificationIconContainer refactor flag state. */
+@Suppress("NOTHING_TO_INLINE")
+object NotificationIconContainerRefactor {
+    const val FLAG_NAME = Flags.FLAG_NOTIFICATIONS_ICON_CONTAINER_REFACTOR
+
+    /** Is the refactor enabled? */
+    @JvmStatic
+    inline val isEnabled
+        get() = Flags.notificationsIconContainerRefactor()
+
+    /**
+     * Called to ensure code is only run when the flag is enabled. This protects users from the
+     * unintended behaviors caused by accidentally running new logic, while also crashing on an eng
+     * build to ensure that the refactor author catches issues in testing.
+     */
+    @JvmStatic
+    inline fun isUnexpectedlyInLegacyMode() =
+        RefactorFlagUtils.isUnexpectedlyInLegacyMode(isEnabled, FLAG_NAME)
+
+    /**
+     * Called to ensure code is only run when the flag is disabled. This will throw an exception if
+     * the flag is enabled to ensure that the refactor author catches issues in testing.
+     */
+    @JvmStatic
+    inline fun assertInLegacyMode() = RefactorFlagUtils.assertInLegacyMode(isEnabled, FLAG_NAME)
+}