Re-land first pass BackgroundTracingManager.

content/browser/tracing/background_tracing_scenario.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 CONTENT_BROWSER_TRACING_BACKGROUND_TRACING_SCENARIO_H_
+#define CONTENT_BROWSER_TRACING_BACKGROUND_TRACING_SCENARIO_H_
+
+#include "base/memory/ref_counted_memory.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/trace_event/trace_event_impl.h"
+#include "content/common/content_export.h"
+
+class BackgroundTracingEndpoint;
+
+class CONTENT_EXPORT BackgroundTracingScenario
+    : public base::RefCounted<BackgroundTracingScenario> {
+ public:
+  BackgroundTracingScenario(scoped_refptr<BackgroundTracingEndpoint>);

[dsinclair, 2015/05/01 15:46:15]

nit: explicit

+
+  scoped_refptr<BackgroundTracingEndpoint> GetEndpoint();
+
+  virtual base::trace_event::CategoryFilter GetCategoryFilter() const;
+
+ protected:
+  virtual ~BackgroundTracingScenario();
+
+  scoped_refptr<BackgroundTracingEndpoint> endpoint_;
+
+  friend class base::RefCounted<BackgroundTracingScenario>;
+};

[dsinclair, 2015/05/01 15:46:15]

Do these get copied or does this need a DISALLOW_COPY_AND_ASSIGN?

+
+#endif  // CONTENT_BROWSER_TRACING_BACKGROUND_TRACING_SCENARIO_H_