i ended up doing it from the command line after all:

cd <local-git-repository>
# pwd contains .git; try git status
# gcloud init was already run
git config credential.helper
git remote add google<x>/

this includes the following effects:

  1. source code now visible inside google cloud repository e.g. from google developers console
  2. remote git repository now visible inside eclipse (mars) as configured remote repository google:<x>/

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