add --x-package-warnings-prefix option to dartanalyzer

pkg/analyzer_cli/lib/src/perf_report.dart

Index: pkg/analyzer_cli/lib/src/perf_report.dart
diff --git a/pkg/analyzer_cli/lib/src/perf_report.dart b/pkg/analyzer_cli/lib/src/perf_report.dart
index 208e56012c1c20103162e787c15db74fe9b83a79..1270e7ce18b56aa3d2ca79facd4d74542c350452 100644
--- a/pkg/analyzer_cli/lib/src/perf_report.dart
+++ b/pkg/analyzer_cli/lib/src/perf_report.dart
@@ -10,7 +10,9 @@ import 'dart:io' show File, Platform;
 import 'package:analyzer/src/generated/utilities_general.dart'
     show PerformanceTag;
 import 'package:analyzer/task/model.dart' show AnalysisTask;
+import 'package:analyzer_cli/src/error_formatter.dart';
 import 'package:analyzer_cli/src/options.dart' show CommandLineOptions;
+import 'package:analyzer/src/generated/engine.dart' show AnalysisContext;
 
 const _JSON = const JsonEncoder.withIndent("  ");
 
@@ -39,7 +41,8 @@ String _osType = () {
   }
 }();
 
-String makePerfReport(int startTime, int endTime, CommandLineOptions options) {
+String makePerfReport(int startTime, int endTime, CommandLineOptions options,
+    AnalysisContext context) {
   int totalTime = endTime - startTime;
   int otherTime = totalTime;
 
@@ -53,6 +56,7 @@ String makePerfReport(int startTime, int endTime, CommandLineOptions options) {
     'dartSdkPath': options.dartSdkPath,
     'strongMode': options.strongMode,
     'showPackageWarnings': options.showPackageWarnings,
+    'showPackageWarningsPrefix': options.showPackageWarningsPrefix,
     'showSdkWarnings': options.showSdkWarnings,
     'definedVariables': options.definedVariables,
     'packageRootPath': options.packageRootPath,
@@ -89,6 +93,8 @@ String makePerfReport(int startTime, int endTime, CommandLineOptions options) {
     'options': optionsJson,
     'totalElapsedTime': totalTime,
     'totalTaskTime': totalTaskTime,
+    'analyzedFiles': context.sources.length,
+    'generatedDiagnostics': ErrorFormatter.inputErrorCount,
     'performanceTags': perfTagsJson,
     'tasks': taskRows.map((r) => r.toJson()).toList(),
   };