Add enable_taskbar_behind_shade to DesktopModeFlags.

Bug: 343194358
Test: n/a no code, just adding flag
Flag: com.android.launcher3.enable_taskbar_behind_shade
Change-Id: Ide8574580afbfd1c1038c34d4b5699a0681fa239
diff --git a/quickstep/src/com/android/launcher3/taskbar/TaskbarActivityContext.java b/quickstep/src/com/android/launcher3/taskbar/TaskbarActivityContext.java
index a1620a1..cfbddbd 100644
--- a/quickstep/src/com/android/launcher3/taskbar/TaskbarActivityContext.java
+++ b/quickstep/src/com/android/launcher3/taskbar/TaskbarActivityContext.java
@@ -81,6 +81,7 @@
 import android.widget.Toast;
 import android.window.DesktopExperienceFlags;
 import android.window.DesktopModeFlags;
+import android.window.DesktopModeFlags.DesktopModeFlag;
 import android.window.RemoteTransition;
 
 import androidx.annotation.NonNull;
@@ -94,6 +95,7 @@
 import com.android.launcher3.BubbleTextView;
 import com.android.launcher3.BubbleTextView.RunningAppState;
 import com.android.launcher3.DeviceProfile;
+import com.android.launcher3.Flags;
 import com.android.launcher3.LauncherPrefs;
 import com.android.launcher3.LauncherSettings.Favorites;
 import com.android.launcher3.R;
@@ -197,6 +199,9 @@
 
     private static final String WINDOW_TITLE = "Taskbar";
 
+    private static final DesktopModeFlag ENABLE_TASKBAR_BEHIND_SHADE = new DesktopModeFlag(
+            Flags::enableTaskbarBehindShade, false);
+
     private final @Nullable Context mNavigationBarPanelContext;
 
     private final TaskbarDragLayer mDragLayer;