deps: cherry-pick 23652c5f from upstream V8

Original commit message:
    Custom tag for the traceEvents array

    This API will be used by Node.js to provide output compatible with
    Chrome devtools.

    Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
    Change-Id: I265495f8af39bfc78d7fdbe43ac308f0920e817d
    Reviewed-on: https://chromium-review.googlesource.com/1044491
    Reviewed-by: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
    Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
    Commit-Queue: Eugene Ostroukhov <eostroukhov@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#53041}

PR-URL: https://github.com/nodejs/node/pull/20608
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

2 files changed, 12 insertions, 2 deletions

diff --git a/deps/v8/src/libplatform/tracing/trace-writer.cc b/deps/v8/src/libplatform/tracing/trace-writer.cc
index 36a8783499..7bfc766469 100644
--- a/deps/v8/src/libplatform/tracing/trace-writer.cc
+++ b/deps/v8/src/libplatform/tracing/trace-writer.cc
@@ -119,8 +119,12 @@ void JSONTraceWriter::AppendArgValue(ConvertableToTraceFormat* value) {
   stream_ << arg_stringified;
 }
 
-JSONTraceWriter::JSONTraceWriter(std::ostream& stream) : stream_(stream) {
-  stream_ << "{\"traceEvents\":[";
+JSONTraceWriter::JSONTraceWriter(std::ostream& stream)
+    : JSONTraceWriter(stream, "traceEvents") {}
+
+JSONTraceWriter::JSONTraceWriter(std::ostream& stream, const std::string& tag)
+    : stream_(stream) {
+  stream_ << "{\"" << tag << "\":[";
 }
 
 JSONTraceWriter::~JSONTraceWriter() { stream_ << "]}"; }
@@ -171,6 +175,11 @@ TraceWriter* TraceWriter::CreateJSONTraceWriter(std::ostream& stream) {
   return new JSONTraceWriter(stream);
 }
 
+TraceWriter* TraceWriter::CreateJSONTraceWriter(std::ostream& stream,
+                                                const std::string& tag) {
+  return new JSONTraceWriter(stream, tag);
+}
+
 }  // namespace tracing
 }  // namespace platform
 }  // namespace v8
diff --git a/deps/v8/src/libplatform/tracing/trace-writer.h b/deps/v8/src/libplatform/tracing/trace-writer.h
index 7e1bdc24d6..d811351389 100644
--- a/deps/v8/src/libplatform/tracing/trace-writer.h
+++ b/deps/v8/src/libplatform/tracing/trace-writer.h
@@ -14,6 +14,7 @@ namespace tracing {
 class JSONTraceWriter : public TraceWriter {
  public:
   explicit JSONTraceWriter(std::ostream& stream);
+  JSONTraceWriter(std::ostream& stream, const std::string& tag);
   ~JSONTraceWriter();
   void AppendTraceEvent(TraceObject* trace_event) override;
   void Flush() override;