Make Tracing Service not use outgoing InterfaceProvider, update conventions

services/tracing/recorder.h

+// 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.
+
+#ifndef SERVICES_TRACING_RECORDER_H_
+#define SERVICES_TRACING_RECORDER_H_
+
+#include "base/macros.h"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "mojo/public/cpp/bindings/string.h"
+#include "services/tracing/data_sink.h"
+#include "services/tracing/public/interfaces/tracing.mojom.h"
+
+namespace tracing {
+
+class Recorder : public mojom::Recorder {
+ public:
+  Recorder(mojom::RecorderRequest request, DataSink* sink);
+  ~Recorder() override;
+
+  // TryRead attempts to read a single chunk from the Recorder pipe if one is
+  // available and passes it to the DataSink. Returns immediately if no
+  // chunk is available.
+  void TryRead();
+
+  // RecorderHandle returns the handle value of the Recorder binding which can
+  // be used to wait until chunks are available.
+  mojo::Handle RecorderHandle() const;
+
+ private:
+  // mojom::Recorder implementation.
+  void Record(const std::string& json) override;
+
+  DataSink* sink_;
+  mojo::Binding<mojom::Recorder> binding_;
+
+  DISALLOW_COPY_AND_ASSIGN(Recorder);
+};
+
+}  // namespace tracing
+
+#endif  // SERVICES_TRACING_RECORDER_H_