update the analyzer and analysis server perf tags

pkg/analyzer/lib/source/pub_package_map_provider.dart

Index: pkg/analyzer/lib/source/pub_package_map_provider.dart
diff --git a/pkg/analyzer/lib/source/pub_package_map_provider.dart b/pkg/analyzer/lib/source/pub_package_map_provider.dart
index 3b2d7311f5c4ac66bcf54d7391585b8c7cf95977..2196d1c8720b9a9e9129daee4558128abf569ae2 100644
--- a/pkg/analyzer/lib/source/pub_package_map_provider.dart
+++ b/pkg/analyzer/lib/source/pub_package_map_provider.dart
@@ -9,6 +9,7 @@ import 'dart:convert';
 import 'dart:core';
 import 'dart:io' as io;
 
+import 'package:analysis_server/src/analysis_server.dart';

[Paul Berry, 2017/06/05 12:42:33]

A file in package:analyzer can't import a file from package:analysis_server,
because analysis_server isn't published on pub (it only exists in the SDK).  Is
there some other way we can accomplish this?

[devoncarew, 2017/06/05 13:35:45]

Thanks for the heads up! Yes, it would be possible to move the tag call back up
to the caller of computePackageMap(). This was creating some misleading time in
perf profile, but would be one way of solving the import issue.

 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/source/package_map_provider.dart';
 import 'package:analyzer/src/dart/sdk/sdk.dart';
@@ -71,7 +72,9 @@ class PubPackageMapProvider implements PackageMapProvider {
     // to respond.
     io.ProcessResult result;
     try {
-      result = _runPubList(folder);
+      result = ServerPerformanceStatistics.pub.makeCurrentWhile(() {
+        return _runPubList(folder);
+      });
     } on io.ProcessException catch (exception, stackTrace) {
       AnalysisEngine.instance.logger.logInformation(
           "Error running pub $PUB_LIST_COMMAND\n$exception\n$stackTrace");