Add Thread-based constructors to TimerScope, TimelineDurationScope.

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 "vm/bitfield.h"
 
 namespace dart {
@@ skipping 180 matching lines @@
         "function",                                                            \
         const_cast<char*>(function.QualifiedUserVisibleNameCString()));        \
   }
 
 class TimelineDurationScope : public StackResource {
  public:
   TimelineDurationScope(Isolate* isolate,
                         TimelineStream* stream,
                         const char* label)
       : StackResource(isolate) {
+    Init(stream, label);
+  }
+
+  TimelineDurationScope(Thread* thread,
+                        TimelineStream* stream,
+                        const char* label)
+      : StackResource(thread) {
+    Init(stream, label);
+  }
+
+  void Init(TimelineStream* stream, const char* label) {
     event_ = stream->StartEvent();
     if (event_ == NULL) {
       return;
     }
     event_->DurationBegin(label);
   }
 
   bool enabled() const {
     return event_ != NULL;
   }
@@ skipping 193 matching lines @@
   TimelineEventBlock* GetNewBlockLocked();
   void PrintJSONEvents(JSONArray* array) const;
 
   Mutex lock_;
   TimelineEventBlock* head_;
 };
 
 }  // namespace dart
 
 #endif  // VM_TIMELINE_H_