Copy event label.

runtime/vm/timeline.h

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_TIMELINE_H_
 #define VM_TIMELINE_H_
 
 #include "include/dart_tools_api.h"
 
 #include "vm/allocation.h"
@@ skipping 268 matching lines @@
       }
       return true;
     }
   }
 
   bool Within(int64_t time_origin_micros,
               int64_t time_extent_micros);
 
   const char* GetSerializedJSON() const;
 
+  void set_owns_label(bool owns_label) {
+    state_ = OwnsLabelBit::update(owns_label, state_);
+  }
+
  private:
   void FreeArguments();
 
   void StreamInit(TimelineStream* stream);
   void Init(EventType event_type, const char* label);
 
   void set_event_type(EventType event_type) {
     // We only reserve 4 bits to hold the event type.
     COMPILE_ASSERT(kNumEventTypes < 16);
     state_ = EventTypeField::update(event_type, state_);
   }
 
   void set_timestamp0(int64_t value) {
     ASSERT(timestamp0_ == 0);
     timestamp0_ = value;
   }
   void set_timestamp1(int64_t value) {
     ASSERT(timestamp1_ == 0);
     timestamp1_ = value;
   }
 
   bool pre_serialized_json() const {
     return PreSerializedJSON::decode(state_);
   }
 
   void set_pre_serialized_json(bool pre_serialized_json) {
     state_ = PreSerializedJSON::update(pre_serialized_json, state_);
   }
 
+  bool owns_label() const {
+    return OwnsLabelBit::decode(state_);
+  }
+
   enum StateBits {
     kEventTypeBit = 0,  // reserve 4 bits for type.
     kPreSerializedJSON = 4,
-    kNextBit = 5,
+    kOwnsLabelBit = 5,
+    kNextBit = 6,
   };
 
   class EventTypeField : public BitField<uword, EventType, kEventTypeBit, 4> {};
   class PreSerializedJSON :
       public BitField<uword, bool, kPreSerializedJSON, 1> {};
+  class OwnsLabelBit : public BitField<uword, bool, kOwnsLabelBit, 1> {};
 
   int64_t timestamp0_;
   int64_t timestamp1_;
   TimelineEventArgument* arguments_;
   intptr_t arguments_length_;
   uword state_;
   const char* label_;
   const char* category_;
   ThreadId thread_;
   Dart_Port isolate_id_;
@@ skipping 501 matching lines @@
 
  private:
   TimelineEventBlock* current_;
   TimelineEventRecorder* recorder_;
 };
 
 
 }  // namespace dart
 
 #endif  // VM_TIMELINE_H_