Introduce an experimental distributed variable values proto field.
Introduce an experimental distributed variable values proto field.

This is the proto change only. This field will enable the saving of
information about a distributed variable's underlying variables.

PiperOrigin-RevId: 333544197
Change-Id: I1c71ccc7bc9f00e9065e725e9154ae80d5aedb6b

petewarden/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,cxxgtxy/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow-pywrap_saved_model,davidzchen/tensorflow,tensorflow/tensorflow,Intel-Corporation/tensorflow,aam-at/tensorflow,sarvex/tensorflow,tensorflow/tensorflow,sarvex/tensorflow,tensorflow/tensorflow,annarev/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-experimental_link_static_libraries_once,aam-at/tensorflow,annarev/tensorflow,frreiss/tensorflow-fred,karllessard/tensorflow,annarev/tensorflow,Intel-Corporation/tensorflow,paolodedios/tensorflow,karllessard/tensorflow,tensorflow/tensorflow,paolodedios/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,cxxgtxy/tensorflow,sarvex/tensorflow,tensorflow/tensorflow-pywrap_saved_model,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,freedomtan/tensorflow,annarev/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow-experimental_link_static_libraries_once,gautam1858/tensorflow,annarev/tensorflow,petewarden/tensorflow,gautam1858/tensorflow,davidzchen/tensorflow,aam-at/tensorflow,Intel-Corporation/tensorflow,aam-at/tensorflow,cxxgtxy/tensorflow,karllessard/tensorflow,davidzchen/tensorflow,sarvex/tensorflow,davidzchen/tensorflow,freedomtan/tensorflow,frreiss/tensorflow-fred,freedomtan/tensorflow,yongtang/tensorflow,sarvex/tensorflow,paolodedios/tensorflow,cxxgtxy/tensorflow,paolodedios/tensorflow,gautam1858/tensorflow,annarev/tensorflow,davidzchen/tensorflow,frreiss/tensorflow-fred,freedomtan/tensorflow,tensorflow/tensorflow,davidzchen/tensorflow,freedomtan/tensorflow,tensorflow/tensorflow,sarvex/tensorflow,davidzchen/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow,karllessard/tensorflow,aam-at/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow-pywrap_saved_model,paolodedios/tensorflow,yongtang/tensorflow,davidzchen/tensorflow,karllessard/tensorflow,davidzchen/tensorflow,cxxgtxy/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,aam-at/tensorflow,gautam1858/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow,frreiss/tensorflow-fred,Intel-tensorflow/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,paolodedios/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,paolodedios/tensorflow,yongtang/tensorflow,annarev/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_saved_model,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_saved_model,petewarden/tensorflow,gautam1858/tensorflow,petewarden/tensorflow,petewarden/tensorflow,davidzchen/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,freedomtan/tensorflow,cxxgtxy/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,aam-at/tensorflow,Intel-tensorflow/tensorflow,petewarden/tensorflow,Intel-Corporation/tensorflow,frreiss/tensorflow-fred,gautam1858/tensorflow,cxxgtxy/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,davidzchen/tensorflow,gautam1858/tensorflow,gautam1858/tensorflow,yongtang/tensorflow,gautam1858/tensorflow,aam-at/tensorflow,yongtang/tensorflow,aam-at/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,frreiss/tensorflow-fred,aam-at/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_tf_optimizer,aam-at/tensorflow,karllessard/tensorflow,Intel-tensorflow/tensorflow,yongtang/tensorflow,davidzchen/tensorflow,Intel-tensorflow/tensorflow,frreiss/tensorflow-fred,freedomtan/tensorflow,annarev/tensorflow,frreiss/tensorflow-fred,karllessard/tensorflow,gautam1858/tensorflow,karllessard/tensorflow,petewarden/tensorflow,paolodedios/tensorflow,gautam1858/tensorflow,sarvex/tensorflow,frreiss/tensorflow-fred,yongtang/tensorflow,frreiss/tensorflow-fred,annarev/tensorflow,sarvex/tensorflow,Intel-Corporation/tensorflow,paolodedios/tensorflow,paolodedios/tensorflow,Intel-tensorflow/tensorflow,annarev/tensorflow,freedomtan/tensorflow,annarev/tensorflow,Intel-Corporation/tensorflow,gautam1858/tensorflow,cxxgtxy/tensorflow,aam-at/tensorflow,freedomtan/tensorflow,Intel-Corporation/tensorflow,Intel-tensorflow/tensorflow,freedomtan/tensorflow,petewarden/tensorflow,yongtang/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_saved_model,freedomtan/tensorflow,tensorflow/tensorflow,Intel-Corporation/tensorflow,paolodedios/tensorflow,yongtang/tensorflow,freedomtan/tensorflow,petewarden/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorf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