Enable FILTERING_MODE for tracing if event filters were given in config

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 <stddef.h>
 #include <stdint.h>
 
@@ skipping 84 matching lines @@
   void AddTraceMessageFilterObserver(TraceMessageFilterObserver* observer);
   void RemoveTraceMessageFilterObserver(TraceMessageFilterObserver* observer);
 
  private:
   friend struct base::LazyInstanceTraitsBase<TracingControllerImpl>;
   friend class TraceMessageFilter;
 
   TracingControllerImpl();
   ~TracingControllerImpl() override;
 
-  bool can_start_tracing() const {
-    return !is_tracing_;
-  }
+  bool can_start_tracing() const { return !enabled_tracing_modes_; }
 
   bool can_stop_tracing() const {
-    return is_tracing_ && !trace_data_sink_.get();
+    return enabled_tracing_modes_ && !trace_data_sink_.get();
   }
 
   bool can_start_monitoring() const {
     return !is_monitoring_;
   }
 
   bool can_stop_monitoring() const {
     return is_monitoring_ && !monitoring_data_sink_.get();
   }
 
@@ skipping 26 matching lines @@
   void OnEndAgentTracingAcked(
       const std::string& agent_name,
       const std::string& events_label,
       const scoped_refptr<base::RefCountedString>& events_str_ptr);
 
   void OnTraceLogStatusReply(TraceMessageFilter* trace_message_filter,
                              const base::trace_event::TraceLogStatus& status);
 
   void SetEnabledOnFileThread(
       const base::trace_event::TraceConfig& trace_config,
-      int mode,
       const base::Closure& callback);
   void SetDisabledOnFileThread(const base::Closure& callback);
   void OnAllTracingAgentsStarted();
   void StopTracingAfterClockSync();
   void OnStopTracingDone();
 
   // Issue clock sync markers to the tracing agents.
   void IssueClockSyncMarker();
   void OnClockSyncMarkerRecordedByAgent(
       const std::string& sync_id,
@@ skipping 20 matching lines @@
   // 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_;
 
   std::vector<base::trace_event::TracingAgent*> additional_tracing_agents_;
   int pending_clock_sync_ack_count_;
   base::OneShotTimer clock_sync_timer_;
 
-  bool is_tracing_;
+  uint8_t enabled_tracing_modes_;
   bool is_monitoring_;
 
   GetCategoriesDoneCallback pending_get_categories_done_callback_;
   GetTraceBufferUsageCallback pending_trace_buffer_usage_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_;
   std::unique_ptr<base::DictionaryValue> metadata_;
 
   DISALLOW_COPY_AND_ASSIGN(TracingControllerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_TRACING_TRACING_CONTROLLER_IMPL_H_