public static ApiClientHeaderProvider.Builder defaultApiClientHeaderProviderBuilder() {
    return ApiClientHeaderProvider.newBuilder()
        .setGeneratedLibToken(
            "gapic", GaxProperties.getLibraryVersion(VideoStitcherServiceStubSettings.class))
        .setTransportToken(
            GaxGrpcProperties.getGrpcTokenName(), GaxGrpcProperties.getGrpcVersion());
  }
Returns a builder for the default ChannelProvider for this service.
java-video-stitcher/google-cloud-video-stitcher/src/main/java/com/google/cloud/video/stitcher/v1/stub/VideoStitcherServiceStubSettings.java