tools: Refactored SummaryReport and move it to its own library

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;
 import "path.dart";
 import "status_file_parser.dart";
+import "summary_report.dart";
 import "test_runner.dart";
 import "test_suite.dart";
 import "utils.dart";
 
 String _pad(String s, int length) {
   StringBuffer buffer = new StringBuffer();
   for (int i = s.length; i < length; i++) {
     buffer.write(' ');
   }
   buffer.write(s);
@@ skipping 278 matching lines @@
                 "$dir");
         }
       }
     }
   }
 }
 
 
 class SummaryPrinter extends EventListener {
   void allTestsKnown() {
-    if (SummaryReport.total > 0) {
-      SummaryReport.printReport();
+    if (summaryReport.total > 0) {
+      summaryReport.printReport();
     }
   }
 }
 
 
 class TimingPrinter extends EventListener {
   final _command2testCases = new Map<Command, List<TestCase>>();
   final _commandOutputs = new Set<CommandOutput>();
   DateTime _startTime;
 
@@ skipping 338 matching lines @@
       return new VerboseProgressIndicator(startTime);
     case 'status':
       return new ProgressIndicator(startTime);
     case 'buildbot':
       return new BuildbotProgressIndicator(startTime);
     default:
       assert(false);
       break;
   }
 }