[clang-format] Support additional common functions for text proto formatting
Summary: This adds a few more common function names expecting a text proto argument.
Reviewers: djasper
Reviewed By: djasper
Subscribers: cfe-commits
Differential Revision: https://reviews.llvm.org/D48760
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@335978 91177308-0d34-0410-b5e6-96231b3b80d8