Add support to timeline for begin and end events

runtime/vm/timeline_analysis.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_ANALYSIS_H_
 #define VM_TIMELINE_ANALYSIS_H_
 
 #include "vm/growable_array.h"
 #include "vm/timeline.h"
 
@@ skipping 120 matching lines @@
 
  private:
   // Adjusts |inclusive_micros_| and |exclusive_micros_| by |micros|.
   // Also, may adjust, max_inclusive_micros_.
   void OnPush(int64_t micros, bool already_on_stack);
 
   // Adjusts |exclusive_micros_| by |exclusive_micros|.
   // Also, may adjust |max_exclusive_micros_|.
   void OnPop(int64_t exclusive_micros);
 
+  // Adjusts |inclusive_micros_| and |exclusive_micros_| by |micros|.
+  // Also, may adjust, |max_inclusive_micros_|.
+  void OnBeginPop(int64_t inclusive_micros,
+                  int64_t exclusive_micros,
+                  bool already_on_stack);
+
+  void UpdateInclusiveMicros(int64_t inclusive_micros, bool already_on_stack);
+  void UpdateExclusiveMicros(int64_t exclusive_micros);
+
   // Adjust inclusive micros.
   void add_inclusive_micros(int64_t delta_micros) {
     inclusive_micros_ += delta_micros;
     ASSERT(inclusive_micros_ >= 0);
   }
 
   // Adjust exclusive micros.
   void add_exclusive_micros(int64_t delta_micros) {
     exclusive_micros_ += delta_micros;
     ASSERT(exclusive_micros_ >= 0);
@@ skipping 39 matching lines @@
 
  private:
   struct StackItem {
     TimelineEvent* event;
     TimelineLabelPauseInfo* pause_info;
     int64_t exclusive_micros;
   };
 
   void ProcessThread(TimelineAnalysisThread* thread);
   bool CheckStack(TimelineEvent* event);
-  void PopFinished(int64_t start);
+  void PopFinishedDurations(int64_t start);
+  void PopBegin(const char* label, int64_t end);
   void Push(TimelineEvent* event);
   bool IsLabelOnStack(const char* label) const;
   intptr_t StackDepth() const;
   StackItem& GetStackTop();
   TimelineLabelPauseInfo* GetOrAddLabelPauseInfo(const char* name);
 
   ZoneGrowableArray<StackItem> stack_;
   ZoneGrowableArray<TimelineLabelPauseInfo*> labels_;
 };
 
 
 class TimelinePauseTrace : public ValueObject {
  public:
   TimelinePauseTrace();
   ~TimelinePauseTrace();
 
   void Print();
 
  private:
   TimelineLabelPauseInfo* GetOrAddLabelPauseInfo(const char* name);
   void Aggregate(const TimelineLabelPauseInfo* thread_pause_info);
   void PrintPauseInfo(const TimelineLabelPauseInfo* pause_info);
 
   ZoneGrowableArray<TimelineLabelPauseInfo*> isolate_labels_;
 };
 
 }  // namespace dart
 
 #endif  // VM_TIMELINE_ANALYSIS_H_