1 files changed, 45 insertions, 0 deletions
diff --git a/deps/v8/src/libplatform/tracing/json-trace-event-listener.h b/deps/v8/src/libplatform/tracing/json-trace-event-listener.h
new file mode 100644
index 0000000000..fc4979f14c
--- /dev/null
+++ b/deps/v8/src/libplatform/tracing/json-trace-event-listener.h
@@ -0,0 +1,45 @@
+// Copyright 2019 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_LIBPLATFORM_TRACING_JSON_TRACE_EVENT_LISTENER_H_
+#define V8_LIBPLATFORM_TRACING_JSON_TRACE_EVENT_LISTENER_H_
+
+#include <ostream>
+
+#include "src/libplatform/tracing/trace-event-listener.h"
+
+namespace perfetto {
+namespace protos {
+class ChromeTraceEvent_Arg;
+}  // namespace protos
+}  // namespace perfetto
+
+namespace v8 {
+namespace platform {
+namespace tracing {
+
+// A listener that converts the proto trace data to JSON and writes it to a
+// file.
+class JSONTraceEventListener final : public TraceEventListener {
+ public:
+  explicit JSONTraceEventListener(std::ostream* stream);
+  ~JSONTraceEventListener() override;
+
+ private:
+  void ProcessPacket(
+      const ::perfetto::protos::ChromeTracePacket& packet) override;
+
+  // Internal implementation
+  void AppendJSONString(const char* str);
+  void AppendArgValue(const ::perfetto::protos::ChromeTraceEvent_Arg& arg);
+
+  std::ostream* stream_;
+  bool append_comma_ = false;
+};
+
+}  // namespace tracing
+}  // namespace platform
+}  // namespace v8
+
+#endif  // V8_LIBPLATFORM_TRACING_JSON_TRACE_EVENT_LISTENER_H_