Make Tracing Service not use outgoing InterfaceProvider, update conventions

services/tracing/recorder.cc

+// Copyright 2015 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 "services/tracing/recorder.h"
+
+namespace tracing {
+
+Recorder::Recorder(mojom::RecorderRequest request, DataSink* sink)
+  : sink_(sink), binding_(this, std::move(request)) {}
+Recorder::~Recorder() {}
+
+void Recorder::TryRead() {
+  binding_.WaitForIncomingMethodCall(MojoDeadline(0));
+}
+
+mojo::Handle Recorder::RecorderHandle() const {
+  return binding_.handle();
+}
+
+void Recorder::Record(const std::string& json) {
+  sink_->AddChunk(json);
+}
+
+}  // namespace tracing