Outputing comma-separated report with percentages

tools/testing/dart/test_progress.dart

 // Copyright (c) 2013, 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.
 
 library test_progress;
 
 import "dart:async";
 import "dart:io";
 import "dart:io" as io;
 import "dart:convert" show JSON;
@@ skipping 290 matching lines @@
           print("\nCopied core dump and binary for unexpected crash to: "
                 "$dir");
         }
       }
     }
   }
 }
 
 
 class SummaryPrinter extends EventListener {
+  final bool jsonOnly;
+
+  SummaryPrinter({this.jsonOnly});
+
   void allTestsKnown() {
-    if (summaryReport.total > 0) {
+    if (jsonOnly) {
+      print("JSON:");
+      print(JSON.encode(summaryReport.values));
+    } else {
       summaryReport.printReport();
     }
   }
 }
 
 
 class TimingPrinter extends EventListener {
   final _command2testCases = new Map<Command, List<TestCase>>();
   final _commandOutputs = new Set<CommandOutput>();
   DateTime _startTime;
@@ skipping 339 matching lines @@
       return new VerboseProgressIndicator(startTime);
     case 'status':
       return new ProgressIndicator(startTime);
     case 'buildbot':
       return new BuildbotProgressIndicator(startTime);
     default:
       assert(false);
       break;
   }
 }