Tracing V2: Fully-functional plugin.

components/tracing/core/proto_zero_message.cc

 // 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.
 
 #include "components/tracing/core/proto_zero_message.h"
 
 #include <string.h>
 
 #include "components/tracing/core/proto_zero_message_handle.h"
 
@@ skipping 107 matching lines @@
       stream_writer_->ReserveBytes(proto::kMessageLengthFieldSize));
   size_ += proto::kMessageLengthFieldSize;
   nested_message_ = message;
 }
 
 void ProtoZeroMessage::EndNestedMessage() {
   size_ += nested_message_->Finalize();
   nested_message_ = nullptr;
 }
 
+#if DCHECK_IS_ON()
+void ProtoZeroMessage::SealField(uint32_t field_id) {
+  if (handle_ != nullptr)
+    handle_->SealField(field_id);
+}
+#endif
+
 }  // namespace v2
 }  // namespace tracing