Add a working command line debugger to Observatory.

runtime/vm/debugger.h

 // Copyright (c) 2012, 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.
 
 #ifndef VM_DEBUGGER_H_
 #define VM_DEBUGGER_H_
 
 #include "include/dart_debugger_api.h"
 
 #include "vm/object.h"
@@ skipping 270 matching lines @@
 // hierarchy.
 class DebuggerEvent {
  public:
   enum EventType {
     kBreakpointReached = 1,
     kBreakpointResolved = 2,
     kExceptionThrown = 3,
     kIsolateCreated = 4,
     kIsolateShutdown = 5,
     kIsolateInterrupted = 6,
+    kIsolateResumed = 7,
   };
 
   explicit DebuggerEvent(Isolate* isolate, EventType event_type)
       : isolate_(isolate),
         type_(event_type),
         top_frame_(NULL),
         breakpoint_(NULL),
         exception_(NULL) {}
 
   Isolate* isolate() const { return isolate_; }
@@ skipping 262 matching lines @@
 
   friend class Isolate;
   friend class SourceBreakpoint;
   DISALLOW_COPY_AND_ASSIGN(Debugger);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_DEBUGGER_H_