Uploader: Add field mask for total_blob_bytes (#3467)
Uploader: Add field mask for total_blob_bytes (#3467)

* Motivation for features / changes
  * Add the field mask for the `total_blob_bytes` field added in #3448

tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard