[Tracing Clock Sync] Implement clock sync 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/time/time.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 {
@@ skipping 134 matching lines @@
   void OnWatchEventMatched();
 
   void SetEnabledOnFileThread(
       const base::trace_event::TraceConfig& trace_config,
       int mode,
       const base::Closure& callback);
   void SetDisabledOnFileThread(const base::Closure& callback);
   void OnStartAgentTracingDone(
       const base::trace_event::TraceConfig& trace_config,
       const StartTracingDoneCallback& callback);
+  void StopTracingAfterClockSync();
   void OnStopTracingDone();
   void OnStartMonitoringDone(
       const base::trace_event::TraceConfig& trace_config,
       const StartMonitoringDoneCallback& callback);
   void OnStopMonitoringDone(const StopMonitoringDoneCallback& callback);
 
   void OnMonitoringStateChanged(bool is_monitoring);
 
+  int GetUniqueClockSyncID();
   // Issue clock sync markers to the tracing agents.
   void IssueClockSyncMarker();
+  void OnClockSyncMarkerRecordedByAgent(
+      int sync_id,
+      const base::TimeTicks& issue_ts,
+      const base::TimeTicks& issue_end_ts);
 
   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_;
 
   StartTracingDoneCallback start_tracing_done_callback_;
   std::vector<base::trace_event::TracingAgent*> additional_tracing_agents_;
+  int clock_sync_id_;
+  int pending_clock_sync_ack_count_;
+  base::OneShotTimer clock_sync_timer_;
 
   bool is_tracing_;
   bool is_monitoring_;
 
   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_