Merge "Expose taskbar toggled signal to Launcher" into udc-dev am: ee18c2cf6f

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/21537627

Change-Id: Ic90644652b020477b158f9df3c135a5380d917dd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

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

@@ -189,6 +189,12 @@ public class TouchInteractionService extends Service
             sIsInitialized = true;
         }
 
+        @BinderThread
+        @Override
+        public void onTaskbarToggled() {
+            // To be implemented.
+        }
+
         @BinderThread
         public void onOverviewToggle() {
             TestLogging.recordEvent(TestProtocol.SEQUENCE_MAIN, "onOverviewToggle");