Add onDisplayRemoveSystemDecorations to TouchInteractionService

onDisplayRemoveSystemDecorations() is a new method in IOverviewProxy.aidl

Bug: 352461502
Flag: com.android.server.display.feature.flags.enable_display_content_mode_management
Test: manually (adb shell settings put secure mirror_built_in_display
{1|0})

Change-Id: I42d96ef27fd62d35ae1ca6134bd74752de3a2b5d

quickstep/src/com/android/launcher3/taskbar/TaskbarManager.java

@@ -701,6 +701,11 @@ public class TaskbarManager {
     public void onDisplayRemoved(int displayId) {
     }
 
+    /**
+     * Signal from SysUI indicating that system decorations should be removed from the display.
+     */
+    public void onDisplayRemoveSystemDecorations(int displayId) {}
+
     private void removeActivityCallbacksAndListeners() {
         if (mActivity != null) {
             mActivity.removeOnDeviceProfileChangeListener(mDebugActivityDeviceProfileChanged);

quickstep/src/com/android/quickstep/TouchInteractionService.java

@@ -315,6 +315,17 @@ public class TouchInteractionService extends Service {
                             taskbarManager -> taskbarManager.onDisplayRemoved(displayId))));
         }
 
+        @BinderThread
+        @Override
+        public void onDisplayRemoveSystemDecorations(int displayId) {
+            // TODO(b/391786915): Replace all
+            // `executeForTouchInteractionService(executeForTaskbarManager())` with just
+            // `executeForTaskbarManager` directly (since `tis` is unused).
+            MAIN_EXECUTOR.execute(() -> executeForTouchInteractionService(
+                    tis -> executeForTaskbarManager(taskbarManager -> taskbarManager
+                            .onDisplayRemoveSystemDecorations(displayId))));
+        }
+
         @BinderThread
         @Override
         public void updateWallpaperVisibility(int displayId, boolean visible) {