message: [TF:TRT] TF-TRT should not split max_workspace_size among TRTEngineOps.
  Because TF GPU executes all GPU compute operations on a single stream, we
  shouldn't split the max_workspace_size among TRTEngineOps. This CL changes
  the bridge to use the converter max_workspace_size for each TRTEngineOp
  before we implement a more sophisticate heuristic.
diff: @@ -755,13 +755,10 @@ Status ConvertAfterShapes(const ConversionParams& params) {
  // Get the EngineInfo for each segment.
  std::unordered_map<string, Node*> node_map;
  TF_RETURN_IF_ERROR(BuildNodeMap(graph, &node_map));
  - float total_num_nodes_in_segments = 0.;
  std::vector<EngineInfo> engine_segments;
  engine_segments.reserve(initial_segments.size());
  std::vector<Node*> reverse_topo_order;
  GetPostOrder(graph, &reverse_topo_order);
  - size_t total_engine_bytes_size = 0;
  - std::vector<size_t> engine_bytes_size;
  segment::SegmentNodesVector converted_segments;
  converted_segments.reserve(initial_segments.size());
  string engine_name_prefix =
  @@ -793,9 +790,6 @@ Status ConvertAfterShapes(const ConversionParams& params) {
  continue;
  }
  - engine_bytes_size.push_back(curr_engine.segment_graph_def.ByteSizeLong());
  - total_engine_bytes_size += engine_bytes_size.back();
  - total_num_nodes_in_segments += curr_segment.size();
  engine_segments.push_back(std::move(curr_engine));
  converted_segments.push_back(std::move(curr_segment));
  @@ -834,13 +828,9 @@ Status ConvertAfterShapes(const ConversionParams& params) {
  engine_nodes.resize(engine_segments.size());
  for (int i = 0; i < engine_segments.size(); ++i) {
  auto& engine = engine_segments.at(i);
  - // Partition the workspace size by the average of node ratio and segment
  - // graphdef size
  - engine.max_workspace_size_bytes =
  - params.max_workspace_size_bytes *
  - (engine_bytes_size.at(i) / total_engine_bytes_size +
  - converted_segments.at(i).size() / total_num_nodes_in_segments) /
  - 2.0;
  + // TODO(b/170762693): implement the heuristic to calculate
  + // max_workspace_size_bytes.
  + engine.max_workspace_size_bytes = params.max_workspace_size_bytes;
  VLOG(1) << "Assigned " << engine.max_workspace_size_bytes << " bytes to "
  << engine.engine_name;
  auto status = CreateTRTNode(params, engine_segments, i,
  