Tracing V2: Field number constants for protobuf plugin.

components/tracing/test/example_proto/test_messages.proto

 // 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.
 
 syntax = "proto2";
 package foo.bar;
 
 import "library.proto";
 
 // This file contains comprehensive set of supported message structures and
@@ skipping 55 matching lines @@
 message NestedA {
   message NestedB {
     message NestedC {
       optional int32 value_c = 1;
     }
     optional NestedC value_b = 1;
   }
   repeated NestedB repeated_a = 2;
   optional NestedB.NestedC super_nested = 3;
 }
+
+message CamelCaseFields {
+  // To check that any reasonable name converts to camel case correctly.
+  optional bool foo_bar_baz = 1;
+  optional bool barBaz = 2;
+  optional bool MooMoo = 3;
+  optional bool URLEncoder = 4;
+  optional bool XMap = 5;
+  optional bool UrLE_nco__der = 6;
+  optional bool __bigBang = 7;
+  optional bool U2 = 8;
+  optional bool bangBig__ = 9;
+
+  // Plugin should end up with error on this name.
+  // optional bool _ = 100;

[Primiano Tucci (use gerrit), 2016/08/05 08:52:05]

not sure what is the value of this comment here?
I'd just rip out lines 88-90

+}