code: public Observable<Page<GalleryImageInner>> listAsync(final String resourceGroupName, final String labAccountName) {
          return listWithServiceResponseAsync(resourceGroupName, labAccountName)
              .map(new Func1<ServiceResponse<Page<GalleryImageInner>>, Page<GalleryImageInner>>() {
                  @Override
                  public Page<GalleryImageInner> call(ServiceResponse<Page<GalleryImageInner>> response) {
                      return response.body();
                  }
              });
      }
docs: List gallery images in a given lab account.
  
  @param resourceGroupName The name of the resource group.
  @param labAccountName The name of the lab Account.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;GalleryImageInner&gt; object