Merge "Ensure we clear binder calling uid prior to removing pinned stacks."

            throw new IllegalArgumentException("Invalid task, not in foreground");

        }

        // When a task is locked, dismiss the pinned stack if it exists

        mStackSupervisor.removeStacksInWindowingModes(WINDOWING_MODE_PINNED);

        // {@code isSystemCaller} is used to distinguish whether this request is initiated by the

        // system or a specific app.

        // * System-initiated requests will only start the pinned mode (screen pinning)

        final int callingUid = Binder.getCallingUid();

        long ident = Binder.clearCallingIdentity();

        try {

            // When a task is locked, dismiss the pinned stack if it exists

            mStackSupervisor.removeStacksInWindowingModes(WINDOWING_MODE_PINNED);

            mLockTaskController.startLockTaskMode(task, isSystemCaller, callingUid);

        } finally {

            Binder.restoreCallingIdentity(ident);