[clang-format] Enable google text proto formatting in R"proto('s

llvm-svn: 325336
diff --git a/clang/lib/Format/Format.cpp b/clang/lib/Format/Format.cpp
index af03696..e77314d 100644
--- a/clang/lib/Format/Format.cpp
+++ b/clang/lib/Format/Format.cpp
@@ -715,6 +715,8 @@
       {
           "pb",
           "PB",
+          "proto",
+          "PROTO",
       },
       /*EnclosingFunctionNames=*/
       {},