Implement formatting exclusion.

mojom/mojom_parser/formatter/formatter_test.go

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package formatter
 
 import (
         "strings"
         "testing"
 )
@@ skipping 31 matching lines @@
         int16 field2@5;
 };
 
 enum FooEnum {
         VALUE1,  // VALUE1 comment.
         VALUE2 = 10,  // VALUE2 comment.
 
   // FooEnum Final Comment.
 };
 
+// no-format
+
+enum SomeWeirdFormat { VALUE1 = 10, VALUE2 = 20};
+
+
+
+
+// end-no-format
+
 // constant comment.
 const int8 foo_constant1 = 10;  // constant comment.
 const int8 foo_constant2 = -10;  // constant comment.
 const float foo_constant3 = -10e10;  // constant comment.
 const int64 foo_constant4 = 0xAD10;  // constant comment.
 const int64 foo_constant5 = -0xAD10;  // constant comment.
 
 // Interface Comment.
 interface InterfaceFoo {  // Interface comment.
         const int8 const_in_interface = 20;
@@ skipping 19 matching lines @@
 
         actual, err := FormatMojom("test.mojom", original)
         if err != nil {
                 t.Fatalf("Parser was not supposed to fail: %s", err.Error())
         }
 
         if original != actual {
                 t.Fatalf("\nExpected:\n%v\n\n*****\n\nActual:\n%v eof", original, actual)
         }
 }