Refactor some Timeline interfaces to be simpler and support streaming

runtime/vm/isolate.h

 // Copyright (c) 2013, 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_ISOLATE_H_
 #define VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/base_isolate.h"
@@ skipping 535 matching lines @@
     return object_id_ring_;
   }
 
   void set_trace_buffer(TraceBuffer* buffer) {
     trace_buffer_ = buffer;
   }
   TraceBuffer* trace_buffer() {
     return trace_buffer_;
   }
 
-  void SetTimelineEventBuffer(TimelineEventBuffer* timeline_event_buffer);
+  void SetTimelineEventRecorder(TimelineEventRecorder* timeline_event_recorder);
 
-  TimelineEventBuffer* timeline_event_buffer() const {
-    return timeline_event_buffer_;
+  TimelineEventRecorder* timeline_event_recorder() const {
+    return timeline_event_recorder_;
   }
 
-  void RemoveTimelineEventBuffer();
+  void RemoveTimelineEventRecorder();
 
   DeoptContext* deopt_context() const { return deopt_context_; }
   void set_deopt_context(DeoptContext* value) {
     ASSERT(value == NULL || deopt_context_ == NULL);
     deopt_context_ = value;
   }
 
   int32_t edge_counter_increment_size() const {
     return edge_counter_increment_size_;
   }
@@ skipping 222 matching lines @@
   int64_t last_allocationprofile_accumulator_reset_timestamp_;
   int64_t last_allocationprofile_gc_timestamp_;
 
   // Ring buffer of objects assigned an id.
   ObjectIdRing* object_id_ring_;
 
   // Trace buffer support.
   TraceBuffer* trace_buffer_;
 
   // TimelineEvent buffer.
-  TimelineEventBuffer* timeline_event_buffer_;
+  TimelineEventRecorder* timeline_event_recorder_;
 
   IsolateProfilerData* profiler_data_;
   Mutex profiler_data_mutex_;
   InterruptableThreadState* thread_state_;
 
   VMTagCounters vm_tag_counters_;
   uword user_tag_;
   RawGrowableObjectArray* tag_table_;
   RawUserTag* current_tag_;
   RawUserTag* default_tag_;
@@ skipping 197 matching lines @@
   intptr_t serialized_args_len_;
   uint8_t* serialized_message_;
   intptr_t serialized_message_len_;
   Isolate::Flags isolate_flags_;
   bool paused_;
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_