Implement system tracing for cros

content/browser/tracing/tracing_controller_impl.h

Index: content/browser/tracing/tracing_controller_impl.h
diff --git a/content/browser/tracing/tracing_controller_impl.h b/content/browser/tracing/tracing_controller_impl.h
index c87dc836c689ec2a23014fc6f145a2ac6bbd2a22..72a9913ec43fa4f342528c8926c78752b95597a7 100644
--- a/content/browser/tracing/tracing_controller_impl.h
+++ b/content/browser/tracing/tracing_controller_impl.h
@@ -113,8 +113,14 @@ class TracingControllerImpl : public TracingController {
   void OnDisableRecordingAcked(
       TraceMessageFilter* trace_message_filter,
       const std::vector<std::string>& known_category_groups);
+  void OnDisableRecordingComplete();
   void OnResultFileClosed();
 
+#if defined(OS_CHROMEOS)
+  void OnEndSystemTracingAcked(
+      const scoped_refptr<base::RefCountedString>& events_str_ptr);
+#endif
+
   void OnCaptureMonitoringSnapshotAcked(
       TraceMessageFilter* trace_message_filter);
   void OnMonitoringSnapshotFileClosed();
@@ -155,6 +161,9 @@ class TracingControllerImpl : public TracingController {
   TraceMessageFilterSet pending_trace_buffer_percent_full_filters_;
   float maximum_trace_buffer_percent_full_;
 
+#if defined(OS_CHROMEOS)
+  bool is_system_tracing_;
+#endif
   bool is_recording_;
   bool is_monitoring_;
   TracingController::Options options_;