Generate better debugging info for actor phase check

tools/coverage.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.
 
 // This test forks a second vm process that runs a dart script as
 // a debug target, single stepping through the entire program, and
 // recording each breakpoint. At the end, a coverage map of the source
 // is printed.
 //
 // Usage: dart coverage.dart [--wire] [--verbose] target_script.dart
@@ skipping 17 matching lines @@
 class Program {
   static int numBps = 0;
 
   // Maps source code url to source.
   static var sources = new Map<String, Source>();
 
   // Takes a JSON Debugger response and increments the count for
   // the source position.
   static void recordBp(Debugger debugger, Map<String,dynamic> msg) {
     // Progress indicator.
-    if (++numBps % 100 == 0) print(numBps);
+    if (++numBps % 1000 == 0) print(numBps);
     var location = msg["params"]["location"];
     if (location == null) return;
     String url = location["url"];
     assert(url != null);
     int tokenPos = location["tokenOffset"];;
     Source s = sources[url];
     if (s == null) {
       debugger.GetLineNumberTable(url);
       s = new Source(url);
       sources[url] = s;
@@ skipping 436 matching lines @@
         targetOpts.add(str);
         break;
     }
   }
 
   Process.start(options.executable, targetOpts).then((Process process) {
     process.stdin.close();
     var debugger = new Debugger(process);
   });
 }