Rework analysis server performance measurement code.

pkg/analyzer/lib/src/services/lint.dart

Index: pkg/analyzer/lib/src/services/lint.dart
diff --git a/pkg/analyzer/lib/src/services/lint.dart b/pkg/analyzer/lib/src/services/lint.dart
index c0edb2c68f25aacf48af950e2c6d449073d4160a..de6a4b4ec81a3b9ddaaae65561c67e51b76bec6f 100644
--- a/pkg/analyzer/lib/src/services/lint.dart
+++ b/pkg/analyzer/lib/src/services/lint.dart
@@ -42,8 +42,7 @@ class LintGenerator {
       : _linters = linters != null ? linters : LINTERS;
 
   void generate() {
-    TimeCounter_TimeCounterHandle timeCounter =
-        PerformanceStatistics.lint.start();
+    PerformanceTag prevTag = PerformanceStatistics.lint.makeCurrent();
     try {
       _compilationUnits.forEach((cu) {
         if (cu.element != null) {
@@ -51,7 +50,7 @@ class LintGenerator {
         }
       });
     } finally {
-      timeCounter.stop();
+      prevTag.makeCurrent();
     }
   }