arc: enable Android tracing in verified-boot mode

chromeos/dbus/arc_trace_agent.h

+// Copyright 2016 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 CHROMEOS_DBUS_ARC_TRACE_AGENT_H_
+#define CHROMEOS_DBUS_ARC_TRACE_AGENT_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "base/task_runner.h"
+#include "base/trace_event/trace_event.h"
+#include "base/trace_event/tracing_agent.h"
+#include "chromeos/chromeos_export.h"
+#include "chromeos/dbus/dbus_client.h"
+
+namespace chromeos {
+
+// ArcTraceAgent is used to commuicate with ArcTraceService and debugd to
+// trigger tracing and collect trace logs.
+class CHROMEOS_EXPORT ArcTraceAgent : public base::trace_event::TracingAgent,
+                                      public DBusClient {
+ public:
+  class Delegate {
+   public:
+    virtual void StartTracing(
+        const base::trace_event::TraceConfig& trace_config) = 0;
+
+    virtual void StopTracing() = 0;
+  };
+
+  ~ArcTraceAgent() override;
+
+  virtual void SetDelegate(Delegate* delegate) = 0;
+
+  virtual void SetStopAgentTracingTaskRunner(
+      scoped_refptr<base::TaskRunner> task_runner) = 0;

[Yusuke Sato, 2017/01/04 23:55:47]

#include base/memory/ref_counted.h ?

[Earl Ou, 2017/01/16 14:05:45]

This method is removed from here.

+
+  static ArcTraceAgent* Create();

[Yusuke Sato, 2017/01/04 23:55:47]

What about returning a unique_ptr? Since the object will be held as a unique_ptr
anyway, I don't think we need to use a raw pointer here.

[Earl Ou, 2017/01/16 14:05:43]

I use singleton.h here now

+
+ protected:
+  // Create() should be used instead.
+  ArcTraceAgent();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ArcTraceAgent);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROMEOS_DBUS_ARC_TRACE_AGENT_H_