Support column-based breakpoints in the VM and Observatory.

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.
 
 library test_helper;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 import 'package:observatory/service_io.dart';
@@ skipping 146 matching lines @@
   }
 }
 
 
 Future<Isolate> hasStoppedAtBreakpoint(Isolate isolate) {
   // Set up a listener to wait for breakpoint events.
   Completer completer = new Completer();
   isolate.vm.getEventStream(VM.kDebugStream).then((stream) {
     var subscription;
     subscription = stream.listen((ServiceEvent event) {
-        print("Event: $event");
         if (event.kind == ServiceEvent.kPauseBreakpoint) {
           print('Breakpoint reached');
           subscription.cancel();
           if (completer != null) {
             // Reload to update isolate.pauseEvent.
             completer.complete(isolate.reload());
             completer = null;
           }
         }
     });
@@ skipping 10 matching lines @@
           completer = null;
         }
       }
     });
   });
 
   return completer.future;  // Will complete when breakpoint hit.
 }
 
 
+Future<Isolate> hasPausedAtStart(Isolate isolate) {
+  // Set up a listener to wait for breakpoint events.
+  Completer completer = new Completer();
+  isolate.vm.getEventStream(VM.kDebugStream).then((stream) {
+    var subscription;
+    subscription = stream.listen((ServiceEvent event) {
+        if (event.kind == ServiceEvent.kPauseStart) {
+          print('Paused at isolate start');
+          subscription.cancel();
+          if (completer != null) {
+            // Reload to update isolate.pauseEvent.
+            completer.complete(isolate.reload());
+            completer = null;
+          }
+        }
+    });
+
+    // Pause may have happened before we subscribed.
+    isolate.reload().then((_) {
+      if ((isolate.pauseEvent != null) &&
+         (isolate.pauseEvent.kind == ServiceEvent.kPauseStart)) {
+        print('Paused at isolate start');
+        subscription.cancel();
+        if (completer != null) {
+          completer.complete(isolate);
+          completer = null;
+        }
+      }
+    });
+  });
+
+  return completer.future;
+}
+
+
 // Currying is your friend.
 IsolateTest setBreakpointAtLine(int line) {
   return (Isolate isolate) async {
     print("Setting breakpoint for line $line");
     Library lib = await isolate.rootLibrary.load();
     Script script = lib.scripts.single;
 
     Breakpoint bpt = await isolate.addBreakpoint(script, line);
     print("Breakpoint is $bpt");
     expect(bpt, isNotNull);
@@ skipping 119 matching lines @@
       }, onError: (e, st) {
         process.requestExit();
         if (!_isWebSocketDisconnect(e)) {
           print('Unexpected exception in service tests: $e $st');
           throw e;
         }
       });
     });
   }
 }