clang-format: Properly format custom options in protocol buffer definitions.

Before:
  option(my_option) = "abc";

After:
  option (my_option) = "abc";

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@199672 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Format/TokenAnnotator.cpp

@@ -1254,7 +1254,8 @@ bool TokenAnnotator::spaceRequiredBetween(const AnnotatedLine &Line,
                                           const FormatToken &Left,
                                           const FormatToken &Right) {
   if (Style.Language == FormatStyle::LK_Proto) {
-    if (Right.is(tok::l_paren) && Left.TokenText == "returns")
+    if (Right.is(tok::l_paren) &&
+        (Left.TokenText == "returns" || Left.TokenText == "option"))
       return true;
   }
   if (Right.is(tok::hashhash))

unittests/Format/FormatTestProto.cpp

@@ -68,5 +68,10 @@ TEST_F(FormatTestProto, MessageFieldAttributes) {
                "    [default = REALLY_REALLY_LONG_CONSTANT_VALUE];");
 }
 
+TEST_F(FormatTestProto, FormatsOptions) {
+  verifyFormat("option java_package = \"my.test.package\";");
+  verifyFormat("option (my_custom_option) = \"abc\";");
+}
+
 } // end namespace tooling
 } // end namespace clang