Add --timing

runtime/vm/timeline_analysis.h

Index: runtime/vm/timeline_analysis.h
diff --git a/runtime/vm/timeline_analysis.h b/runtime/vm/timeline_analysis.h
index 5f5049b691674e3b0e8330f2825e58d745e256c4..b49d82147d2db32ba908a45627892bdba2720849 100644
--- a/runtime/vm/timeline_analysis.h
+++ b/runtime/vm/timeline_analysis.h
@@ -150,6 +150,8 @@ class TimelineLabelPauseInfo : public ZoneAllocated {
     ASSERT(exclusive_micros_ >= 0);
   }
 
+  void Aggregate(const TimelineLabelPauseInfo* thread_pause_info);
+
   const char* name_;
   int64_t inclusive_micros_;
   int64_t exclusive_micros_;
@@ -157,6 +159,7 @@ class TimelineLabelPauseInfo : public ZoneAllocated {
   int64_t max_exclusive_micros_;
 
   friend class TimelinePauses;
+  friend class TimelinePauseTrace;
 };
 
 
@@ -177,6 +180,14 @@ class TimelinePauses : public TimelineAnalysis {
   int64_t MaxInclusiveTime(const char* name) const;
   int64_t MaxExclusiveTime(const char* name) const;
 
+  intptr_t NumPauseInfos() const {
+    return labels_.length();
+  }
+
+  const TimelineLabelPauseInfo* PauseInfoAt(intptr_t i) const {
+    return labels_.At(i);
+  }
+
  private:
   struct StackItem {
     TimelineEvent* event;
@@ -188,7 +199,7 @@ class TimelinePauses : public TimelineAnalysis {
   bool CheckStack(TimelineEvent* event);
   void PopFinished(int64_t start);
   void Push(TimelineEvent* event);
-  bool IsLabelOnStack(const char* label);
+  bool IsLabelOnStack(const char* label) const;
   intptr_t StackDepth() const;
   StackItem& GetStackTop();
   TimelineLabelPauseInfo* GetOrAddLabelPauseInfo(const char* name);
@@ -197,6 +208,22 @@ class TimelinePauses : public TimelineAnalysis {
   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_