WIP: The tracing service prototype

content/browser/tracing/tracing_controller_impl_data_sinks.cc

Index: content/browser/tracing/tracing_controller_impl_data_sinks.cc
diff --git a/content/browser/tracing/tracing_controller_impl_data_sinks.cc b/content/browser/tracing/tracing_controller_impl_data_sinks.cc
index 73cb23886714d839277b9a7649fedab654180d35..dcbe8db1d229efcd92087db51fa30e71097d5872 100644
--- a/content/browser/tracing/tracing_controller_impl_data_sinks.cc
+++ b/content/browser/tracing/tracing_controller_impl_data_sinks.cc
@@ -17,9 +17,6 @@ namespace content {
 
 namespace {
 
-const char kChromeTraceLabel[] = "traceEvents";
-const char kMetadataTraceLabel[] = "metadata";
-
 class StringTraceDataEndpoint : public TraceDataEndpoint {
  public:
   typedef base::Callback<void(std::unique_ptr<const base::DictionaryValue>,
@@ -143,37 +140,14 @@ class TraceDataSinkImplBase : public TracingController::TraceDataSink {
 class JSONTraceDataSink : public TraceDataSinkImplBase {
  public:
   explicit JSONTraceDataSink(scoped_refptr<TraceDataEndpoint> endpoint)
-      : endpoint_(endpoint), had_received_first_chunk_(false) {}
+      : endpoint_(endpoint) {}
 
   void AddTraceChunk(const std::string& chunk) override {
-    std::string trace_string;
-    if (had_received_first_chunk_)
-      trace_string = ",";
-    else
-      trace_string = "{\"" + std::string(kChromeTraceLabel) + "\":[";
-    trace_string += chunk;
-    had_received_first_chunk_ = true;
-
-    endpoint_->ReceiveTraceChunk(base::MakeUnique<std::string>(trace_string));
+    endpoint_->ReceiveTraceChunk(base::MakeUnique<std::string>(chunk));
   }
 
   void Close() override {
-    endpoint_->ReceiveTraceChunk(base::MakeUnique<std::string>("]"));
-
-    for (auto const &it : GetAgentTrace())
-      endpoint_->ReceiveTraceChunk(
-          base::MakeUnique<std::string>(",\"" + it.first + "\": " + it.second));
-
     std::unique_ptr<base::DictionaryValue> metadata(TakeMetadata());
-    std::string metadataJSON;
-
-    if (base::JSONWriter::Write(*metadata, &metadataJSON) &&
-        !metadataJSON.empty()) {
-      endpoint_->ReceiveTraceChunk(base::MakeUnique<std::string>(
-          ",\"" + std::string(kMetadataTraceLabel) + "\": " + metadataJSON));
-    }
-
-    endpoint_->ReceiveTraceChunk(base::MakeUnique<std::string>("}"));
     endpoint_->ReceiveTraceFinalContents(std::move(metadata));
   }
 
@@ -181,7 +155,6 @@ class JSONTraceDataSink : public TraceDataSinkImplBase {
   ~JSONTraceDataSink() override {}
 
   scoped_refptr<TraceDataEndpoint> endpoint_;
-  bool had_received_first_chunk_;
   DISALLOW_COPY_AND_ASSIGN(JSONTraceDataSink);
 };