Per-closure breakpoints; restructure breakpoint implementation to keep a list of conditions.

runtime/observatory/tests/service/test_helper.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.
 // VMOptions=--compile-all --error_on_bad_type --error_on_bad_override --checked
 
 library test_helper;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
@@ skipping 90 matching lines @@
     }
     print(''); // Print blank line to signal that we are ready.
     if (testeeConcurrent != null) {
       testeeConcurrent();
     }
     // Wait around for the process to be killed.
     stdin.first.then((_) => exit(0));
   } else {
     var process = new _TestLauncher();
     process.launch(pause_on_exit).then((port) {
+      if (mainArgs.contains("--gdb")) {
+        port = 8181;
+      }
       String addr = 'ws://localhost:$port/ws';
       var testIndex = 1;
       var totalTests = tests.length;
       var name = Platform.script.pathSegments.last;
       runZoned(() {
         new WebSocketVM(new WebSocketVMTarget(addr)).load()
             .then((VM vm) => vm.isolates.first.load())
             .then((Isolate isolate) => Future.forEach(tests, (test) {
               print('Running $name [$testIndex/$totalTests]');
               testIndex++;
@@ skipping 64 matching lines @@
     }
     print(''); // Print blank line to signal that we are ready.
     if (testeeConcurrent != null) {
       await testeeConcurrent();
     }
     // Wait around for the process to be killed.
     stdin.first.then((_) => exit(0));
   } else {
     var process = new _TestLauncher();
     process.launch(pause_on_exit).then((port) async {
+      if (mainArgs.contains("--gdb")) {
+        port = 8181;
+      }
       String addr = 'ws://localhost:$port/ws';
       var testIndex = 1;
       var totalTests = tests.length;
       var name = Platform.script.pathSegments.last;
       runZoned(() {
         new WebSocketVM(new WebSocketVMTarget(addr)).load()
             .then((VM vm) => Future.forEach(tests, (test) {
               print('Running $name [$testIndex/$totalTests]');
               testIndex++;
               return test(vm);
             })).then((_) => process.requestExit());
       }, onError: (e, st) {
         process.requestExit();
         if (!_isWebSocketDisconnect(e)) {
           print('Unexpected exception in service tests: $e $st');
           throw e;
         }
       });
     });
   }
 }