update the analyzer and analysis server perf tags

pkg/analyzer/lib/src/dart/analysis/driver.dart

 // Copyright (c) 2016, 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.
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:typed_data';
 
 import 'package:analyzer/context/context_root.dart';
 import 'package:analyzer/context/declared_variables.dart';
 import 'package:analyzer/dart/analysis/results.dart' as results;
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart'
     show CompilationUnitElement, LibraryElement;
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/error/listener.dart';
 import 'package:analyzer/exception/exception.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/dart/analysis/file_state.dart';
 import 'package:analyzer/src/dart/analysis/file_tracker.dart';
 import 'package:analyzer/src/dart/analysis/index.dart';
 import 'package:analyzer/src/dart/analysis/library_analyzer.dart';
 import 'package:analyzer/src/dart/analysis/library_context.dart';
 import 'package:analyzer/src/dart/analysis/search.dart';
 import 'package:analyzer/src/dart/analysis/status.dart';
 import 'package:analyzer/src/dart/analysis/top_level_declaration.dart';
 import 'package:analyzer/src/generated/engine.dart'
-    show AnalysisContext, AnalysisEngine, AnalysisOptions;
+    show
+        AnalysisContext,
+        AnalysisEngine,
+        AnalysisOptions,
+        PerformanceStatistics;
 import 'package:analyzer/src/generated/source.dart';
+import 'package:analyzer/src/generated/utilities_general.dart';
 import 'package:analyzer/src/lint/registry.dart' as linter;
 import 'package:analyzer/src/summary/format.dart';
 import 'package:analyzer/src/summary/idl.dart';
 import 'package:analyzer/src/summary/package_bundle_reader.dart';
 import 'package:front_end/src/base/api_signature.dart';
 import 'package:front_end/src/base/performace_logger.dart';
 import 'package:front_end/src/incremental/byte_store.dart';
 import 'package:meta/meta.dart';
 
+class DriverPerformance {
+  static final PerformanceTag driver =
+      PerformanceStatistics.analyzer.createChild('driver');
+
+  static final PerformanceTag cache = driver.createChild('cache');
+}
+
 /**
  * This class computes [AnalysisResult]s for Dart files.
  *
  * Let the set of "explicitly analyzed files" denote the set of paths that have
  * been passed to [addFile] but not subsequently passed to [removeFile]. Let
  * the "current analysis results" denote the map from the set of explicitly
  * analyzed files to the most recent [AnalysisResult] delivered to [results]
  * for each file. Let the "current file state" represent a map from file path
  * to the file contents most recently read from that file, or fetched from the
  * content cache (considering all possible possible file paths, regardless of
@@ skipping 922 matching lines @@
     // Skip reading if the signature, so errors, are the same as the last time.
     if (skipIfSameSignature) {
       assert(!withUnit);
       if (_lastProducedSignatures[path] == signature) {
         return AnalysisResult._UNCHANGED;
       }
     }
 
     // If we don't need the fully resolved unit, check for the cached result.
     if (!withUnit) {
-      List<int> bytes = _byteStore.get(key);
+      List<int> bytes = DriverPerformance.cache.makeCurrentWhile(() {
+        return _byteStore.get(key);
+      });
       if (bytes != null) {
         return _getAnalysisResultFromBytes(file, signature, bytes);
       }
     }
 
     // We need the fully resolved unit, or the result is not cached.
     return _logger.run('Compute analysis result for $path', () {
       try {
         LibraryContext libraryContext = _createLibraryContext(library);
         try {
@@ skipping 991 matching lines @@
           libraryDeclarations.add(new TopLevelDeclarationInSource(
               file.source, declaration, isExported));
         }
       }
     }
 
     // We're not done yet.
     return false;
   }
 }