Support column-based breakpoints in the VM and Observatory.

runtime/observatory/tests/service/debugger_location_test.dart

 // Copyright (c) 2015, 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=--error_on_bad_type --error_on_bad_override
 
 import 'package:observatory/service_io.dart';
 import 'package:observatory/debugger.dart';
 import 'package:unittest/unittest.dart';
 import 'test_helper.dart';
 import 'dart:async';
@@ skipping 41 matching lines @@
 
 var tests = [
 
 hasStoppedAtBreakpoint,
 
 // Parse '' => current position
 (Isolate isolate) {
   return initDebugger(isolate).then((debugger) {
     return DebuggerLocation.parse(debugger, '').then((DebuggerLocation loc) {
       expect(loc.valid, isTrue);
-      expect(loc.toString(), equals('debugger_location_test.dart:17'));
+      expect(loc.toString(), equals('debugger_location_test.dart:17:5'));
     });
   });
 },
 
 // Parse line
 (Isolate isolate) {
   return initDebugger(isolate).then((debugger) {
     return DebuggerLocation.parse(debugger, '18').then((DebuggerLocation loc) {
       expect(loc.valid, isTrue);
       expect(loc.toString(), equals('debugger_location_test.dart:18'));
@@ skipping 183 matching lines @@
     return DebuggerLocation.complete(debugger, 'DebuggerLocationTestFoo.q')
       .then((List<String> completions) {
         expect(completions.toString(), equals('[]'));
       });
   });
 },
 
 ];
 
 main(args) => runIsolateTests(args, tests, testeeConcurrent: testFunction);