[Tracing Clock Sync] Add TracingAgent interface in Chrome

content/browser/tracing/tracing_controller_impl.h

 // Copyright (c) 2013 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_TRACING_CONTROLLER_IMPL_H_
 #define CONTENT_BROWSER_TRACING_TRACING_CONTROLLER_IMPL_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/lazy_instance.h"
 #include "base/trace_event/memory_dump_manager.h"
+#include "base/trace_event/tracing_agent.h"
 #include "content/public/browser/tracing_controller.h"
 
 namespace base {
 class RefCountedString;
 class RefCountedMemory;
 }
 
 namespace content {
 
 class TraceMessageFilter;
 class TracingUI;
 
 class TracingControllerImpl
     : public TracingController,
-      public base::trace_event::MemoryDumpManagerDelegate {
+      public base::trace_event::MemoryDumpManagerDelegate,
+      public base::trace_event::TracingAgent {
  public:
   static TracingControllerImpl* GetInstance();
 
   // TracingController implementation.
   bool GetCategories(const GetCategoriesDoneCallback& callback) override;
   bool StartTracing(const base::trace_event::TraceConfig& trace_config,
                     const StartTracingDoneCallback& callback) override;
   bool StopTracing(const scoped_refptr<TraceDataSink>& sink) override;
   bool StartMonitoring(
       const base::trace_event::TraceConfig& trace_config,
       const StartMonitoringDoneCallback& callback) override;
   bool StopMonitoring(
       const StopMonitoringDoneCallback& callback) override;
   void GetMonitoringStatus(
       bool* out_enabled,
       base::trace_event::TraceConfig* out_trace_config) override;
   bool CaptureMonitoringSnapshot(
       const scoped_refptr<TraceDataSink>& sink) override;
   bool GetTraceBufferUsage(
       const GetTraceBufferUsageCallback& callback) override;
   bool SetWatchEvent(const std::string& category_name,
                      const std::string& event_name,
                      const WatchEventCallback& callback) override;
   bool CancelWatchEvent() override;
   bool IsTracing() const override;
 
   void RegisterTracingUI(TracingUI* tracing_ui);
   void UnregisterTracingUI(TracingUI* tracing_ui);
 
+  // base::trace_event::TracingAgent implementation.
+  std::string GetTracingAgentName() override;
+  std::string GetTraceEventLabel() override;
+  bool StartAgentTracing(
+      const base::trace_event::TraceConfig& trace_config) override;
+  void StopAgentTracing(const StopAgentTracingCallback& callback) override;
+  bool SupportsExplicitClockSync() override;
+  void RecordClockSyncMarker(
+      int sync_id,
+      const RecordClockSyncMarkerCallback& callback) override;
+
   // base::trace_event::MemoryDumpManagerDelegate implementation.
   void RequestGlobalMemoryDump(
       const base::trace_event::MemoryDumpRequestArgs& args,
       const base::trace_event::MemoryDumpCallback& callback) override;
   uint64 GetTracingProcessId() const override;
 
   class TraceMessageFilterObserver {
    public:
     virtual void OnTraceMessageFilterAdded(TraceMessageFilter* filter) = 0;
     virtual void OnTraceMessageFilterRemoved(TraceMessageFilter* filter) = 0;
@@ skipping 47 matching lines @@
       bool has_more_events);
   // Callback of TraceLog::FlushMonitoring() for the local trace.
   void OnLocalMonitoringTraceDataCollected(
       const scoped_refptr<base::RefCountedString>& events_str_ptr,
       bool has_more_events);
 
   void OnStopTracingAcked(
       TraceMessageFilter* trace_message_filter,
       const std::vector<std::string>& known_category_groups);
 
-#if defined(OS_CHROMEOS) || defined(OS_WIN)
-  void OnEndSystemTracingAcked(
-      const scoped_refptr<base::RefCountedString>& events_str_ptr);
-#endif
-
-  void OnEndPowerTracingAcked(
+  void OnEndAgentTracingAcked(
+      const std::string& agent_name,
+      const std::string& events_label,
       const scoped_refptr<base::RefCountedString>& events_str_ptr);
 
   void OnCaptureMonitoringSnapshotAcked(
       TraceMessageFilter* trace_message_filter);
 
   void OnTraceLogStatusReply(TraceMessageFilter* trace_message_filter,
                              const base::trace_event::TraceLogStatus& status);
   void OnProcessMemoryDumpResponse(TraceMessageFilter* trace_message_filter,
                                    uint64 dump_guid,
                                    bool success);
 
   // Callback of MemoryDumpManager::CreateProcessDump().
   void OnBrowserProcessMemoryDumpDone(uint64 dump_guid, bool success);
 
   void FinalizeGlobalMemoryDumpIfAllProcessesReplied();
 
   void OnWatchEventMatched();
 
   void SetEnabledOnFileThread(
       const base::trace_event::TraceConfig& trace_config,
       int mode,
       const base::Closure& callback);
   void SetDisabledOnFileThread(const base::Closure& callback);
-  void OnStartTracingDone(
+  void OnStartAgentTracingDone(
       const base::trace_event::TraceConfig& trace_config,
       const StartTracingDoneCallback& callback);
   void OnStopTracingDone();
   void OnStartMonitoringDone(
       const base::trace_event::TraceConfig& trace_config,
       const StartMonitoringDoneCallback& callback);
   void OnStopMonitoringDone(const StopMonitoringDoneCallback& callback);
 
   void OnMonitoringStateChanged(bool is_monitoring);
 
+  // Issue clock sync markers to the tracing agents.
+  void IssueClockSyncMarker();
+
   typedef std::set<scoped_refptr<TraceMessageFilter>> TraceMessageFilterSet;
   TraceMessageFilterSet trace_message_filters_;
 
   // Pending acks for StopTracing.
   int pending_stop_tracing_ack_count_;
   TraceMessageFilterSet pending_stop_tracing_filters_;
 
   // Pending acks for CaptureMonitoringSnapshot.
   int pending_capture_monitoring_snapshot_ack_count_;
   TraceMessageFilterSet pending_capture_monitoring_filters_;
 
   // Pending acks for GetTraceLogStatus.
   int pending_trace_log_status_ack_count_;
   TraceMessageFilterSet pending_trace_log_status_filters_;
   float maximum_trace_buffer_usage_;
   size_t approximate_event_count_;
 
   // Pending acks for memory RequestGlobalDumpPoint.
   int pending_memory_dump_ack_count_;
   int failed_memory_dump_count_;
   TraceMessageFilterSet pending_memory_dump_filters_;
   uint64 pending_memory_dump_guid_;
   base::trace_event::MemoryDumpCallback pending_memory_dump_callback_;
 
-#if defined(OS_CHROMEOS) || defined(OS_WIN)
-  bool is_system_tracing_;
-#endif
+  StartTracingDoneCallback start_tracing_done_callback_;
+  std::vector<base::trace_event::TracingAgent*> additional_tracing_agents_;
+
   bool is_tracing_;
   bool is_monitoring_;
-  bool is_power_tracing_;
 
   GetCategoriesDoneCallback pending_get_categories_done_callback_;
   GetTraceBufferUsageCallback pending_trace_buffer_usage_callback_;
 
   std::string watch_category_name_;
   std::string watch_event_name_;
   WatchEventCallback watch_event_callback_;
 
   base::ObserverList<TraceMessageFilterObserver>
       trace_message_filter_observers_;
 
   std::set<std::string> known_category_groups_;
   std::set<TracingUI*> tracing_uis_;
   scoped_refptr<TraceDataSink> trace_data_sink_;
   scoped_refptr<TraceDataSink> monitoring_data_sink_;
 
   DISALLOW_COPY_AND_ASSIGN(TracingControllerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_TRACING_TRACING_CONTROLLER_IMPL_H_