Add a new 'summary' performance tag.

pkg/analyzer/lib/src/context/context.dart

Index: pkg/analyzer/lib/src/context/context.dart
diff --git a/pkg/analyzer/lib/src/context/context.dart b/pkg/analyzer/lib/src/context/context.dart
index 2ea723187c52c9e667970f060fc0e9de5f264c14..4714557e35a910b1a9a07d958b866ce1cca77006 100644
--- a/pkg/analyzer/lib/src/context/context.dart
+++ b/pkg/analyzer/lib/src/context/context.dart
@@ -488,27 +488,29 @@ class AnalysisContextImpl implements InternalAnalysisContext {
 
   @override
   bool aboutToComputeResult(CacheEntry entry, ResultDescriptor result) {
-    AnalysisTarget target = entry.target;
-    // TYPE_PROVIDER
-    if (target is AnalysisContextTarget && result == TYPE_PROVIDER) {
-      DartSdk dartSdk = sourceFactory.dartSdk;
-      if (dartSdk != null) {
-        AnalysisContext sdkContext = dartSdk.context;
-        if (!identical(sdkContext, this) &&
-            sdkContext is InternalAnalysisContext) {
-          return sdkContext.aboutToComputeResult(entry, result);
+    return PerformanceStatistics.summary.makeCurrentWhile(() {
+      AnalysisTarget target = entry.target;
+      // TYPE_PROVIDER
+      if (target is AnalysisContextTarget && result == TYPE_PROVIDER) {
+        DartSdk dartSdk = sourceFactory.dartSdk;
+        if (dartSdk != null) {
+          AnalysisContext sdkContext = dartSdk.context;
+          if (!identical(sdkContext, this) &&
+              sdkContext is InternalAnalysisContext) {
+            return sdkContext.aboutToComputeResult(entry, result);
+          }
         }
       }
-    }
-    // A result for a Source.
-    Source source = target.source;
-    if (source != null) {
-      InternalAnalysisContext context = _cache.getContextFor(source);
-      if (!identical(context, this)) {
-        return context.aboutToComputeResult(entry, result);
+      // A result for a Source.
+      Source source = target.source;
+      if (source != null) {
+        InternalAnalysisContext context = _cache.getContextFor(source);
+        if (!identical(context, this)) {
+          return context.aboutToComputeResult(entry, result);
+        }
       }
-    }
-    return false;
+      return false;
+    });
   }
 
   @override
@@ -1061,7 +1063,7 @@ class AnalysisContextImpl implements InternalAnalysisContext {
 
   @override
   AnalysisResult performAnalysisTask() {
-    return PerformanceStatistics.performAnaysis.makeCurrentWhile(() {
+    return PerformanceStatistics.performAnalysis.makeCurrentWhile(() {
       _evaluatePendingFutures();
       bool done = !driver.performAnalysisTask();
       List<ChangeNotice> notices = _getChangeNotices(done);