[Tracing Clock Sync] Add TracingAgent interface in Chrome

chromeos/dbus/debug_daemon_client.h

 // Copyright (c) 2012 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_DEBUG_DAEMON_CLIENT_H_
 #define CHROMEOS_DBUS_DEBUG_DAEMON_CLIENT_H_
 
 #include <map>
 
 #include "base/callback.h"
 #include "base/files/file.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/task_runner.h"
+#include "base/trace_event/tracing_agent.h"
 #include "chromeos/chromeos_export.h"
 #include "chromeos/dbus/dbus_client.h"
 #include "third_party/cros_system_api/dbus/service_constants.h"
 
 namespace chromeos {
 
 // DebugDaemonClient is used to communicate with the debug daemon.
-class CHROMEOS_EXPORT DebugDaemonClient : public DBusClient {
+class CHROMEOS_EXPORT DebugDaemonClient
+    : public DBusClient,
+      public base::trace_event::TracingAgent {
  public:
   ~DebugDaemonClient() override;
 
   // Called once GetDebugLogs() is complete. Takes one parameter:
   // - succeeded: was the logs stored successfully.
   typedef base::Callback<void(bool succeeded)> GetDebugLogsCallback;
 
   // Requests to store debug logs into |file| and calls |callback|
   // when completed. Debug logs will be stored in the .tgz if
   // |is_compressed| is true, otherwise in logs will be stored in .tar format.
@@ skipping 74 matching lines @@
 
   // Gets scrubbed logs from debugd.
   virtual void GetScrubbedLogs(const GetLogsCallback& callback) = 0;
 
   // Gets all logs collected by debugd.
   virtual void GetAllLogs(const GetLogsCallback& callback) = 0;
 
   // Gets list of user log files that must be read by Chrome.
   virtual void GetUserLogFiles(const GetLogsCallback& callback) = 0;
 
-  // Requests to start system/kernel tracing.
-  virtual void StartSystemTracing() = 0;
+  virtual void SetStopAgentTracingTaskRunner(
+      scoped_refptr<base::TaskRunner> task_runner) = 0;
 
-  // Called once RequestStopSystemTracing() is complete. Takes one parameter:
-  // - result: the data collected while tracing was active
-  typedef base::Callback<void(const scoped_refptr<base::RefCountedString>&
-      result)> StopSystemTracingCallback;
-
-  // Requests to stop system tracing and calls |callback| when completed.
-  virtual bool RequestStopSystemTracing(
-      scoped_refptr<base::TaskRunner> task_runner,
-      const StopSystemTracingCallback& callback) = 0;
-
-  // Returns an empty SystemTracingCallback that does nothing.
-  static StopSystemTracingCallback EmptyStopSystemTracingCallback();
+  // Returns an empty StopAgentTracingCallback that does nothing.
+  static StopAgentTracingCallback EmptyStopAgentTracingCallback();
 
   // Called once TestICMP() is complete. Takes two parameters:
   // - succeeded: information was obtained successfully.
   // - status: information about ICMP connectivity to a specified host as json.
   //   For details please refer to
   //   https://gerrit.chromium.org/gerrit/#/c/30310/2/src/helpers/icmp.cc
   typedef base::Callback<void(bool succeeded, const std::string& status)>
       TestICMPCallback;
 
   // Tests ICMP connectivity to a specified host. The |ip_address| contains the
@@ skipping 58 matching lines @@
   // Create() should be used instead.
   DebugDaemonClient();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DebugDaemonClient);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_DEBUG_DAEMON_CLIENT_H_