In analyzer, track time spent computing library cycles.

pkg/analyzer/lib/src/generated/engine.dart

Index: pkg/analyzer/lib/src/generated/engine.dart
diff --git a/pkg/analyzer/lib/src/generated/engine.dart b/pkg/analyzer/lib/src/generated/engine.dart
index 3e4e7719d531c06c38bfc942d318f2993e850c23..dba8f84c40590bbd9766c7584018d534b5876598 100644
--- a/pkg/analyzer/lib/src/generated/engine.dart
+++ b/pkg/analyzer/lib/src/generated/engine.dart
@@ -3450,7 +3450,12 @@ class AnalysisContextImpl implements InternalAnalysisContext {
     try {
       AnalysisContextImpl_CycleBuilder builder =
           new AnalysisContextImpl_CycleBuilder(this);
-      builder.computeCycleContaining(source);
+      PerformanceTag prevTag = PerformanceStatistics.cycles.makeCurrent();
+      try {
+        builder.computeCycleContaining(source);
+      } finally {
+        prevTag.makeCurrent();
+      }
       AnalysisContextImpl_TaskData taskData = builder.taskData;
       if (taskData != null) {
         return taskData;
@@ -10487,6 +10492,11 @@ class PerformanceStatistics {
    * The [PerformanceTag] for time spent in linting.
    */
   static PerformanceTag lint = new PerformanceTag('lint');
+
+  /**
+   * The [PerformanceTag] for time spent computing cycles.
+   */
+  static PerformanceTag cycles = new PerformanceTag('cycles');
 }
 
 /**