Add aconfig flag for media refactor.

Flag: ACONFIG media_controls_refactor DISABLED
Bug: 326408371
Test: atest SystemUITests
Change-Id: I81899c405dc25014fbaf80c8514067638e17d461

packages/SystemUI/aconfig/systemui.aconfig

@@ -563,3 +563,10 @@ flag {
         purpose: PURPOSE_BUGFIX
     }
 }
+
+flag {
+    name: "media_controls_refactor"
+    namespace: "systemui"
+    description: "Refactors media code to follow the recommended architecture"
+    bug: "326408371"
+}

packages/SystemUI/src/com/android/systemui/media/controls/util/MediaControlsRefactorFlag.kt

+/*
+ * Copyright (C) 2024 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.media.controls.util
+
+import com.android.systemui.Flags
+import com.android.systemui.flags.FlagToken
+import com.android.systemui.flags.RefactorFlagUtils
+
+/** Helper for reading or using the media_controls_refactor flag state. */
+@Suppress("NOTHING_TO_INLINE")
+object MediaControlsRefactorFlag {
+    /** The aconfig flag name */
+    const val FLAG_NAME = Flags.FLAG_MEDIA_CONTROLS_REFACTOR
+
+    /** A token used for dependency declaration */
+    val token: FlagToken
+        get() = FlagToken(FLAG_NAME, isEnabled)
+
+    /** Is the flag enabled? */
+    @JvmStatic
+    inline val isEnabled
+        get() = Flags.mediaControlsRefactor()
+
+    /**
+     * 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)
+}

packages/SystemUI/src/com/android/systemui/media/controls/util/MediaFlags.kt

@@ -58,4 +58,7 @@ constructor(
     /** Check whether to use scene framework */
     fun isSceneContainerEnabled() =
         sceneContainerFlags.isEnabled() && MediaInSceneContainerFlag.isEnabled
+
+    /** Check whether to use media refactor code */
+    fun isMediaControlsRefactorEnabled() = MediaControlsRefactorFlag.isEnabled
 }