Fix disabling all break points from within the debug event callback.

src/debug.h

Index: src/debug.h
diff --git a/src/debug.h b/src/debug.h
index b8348fd52af0dbd4656e4ea88ec3535d1656591b..ea17cb0e9c82c9f2844c3267d7d89d511409bb1a 100644
--- a/src/debug.h
+++ b/src/debug.h
@@ -515,6 +515,9 @@ class Debug {
   // Check whether there are commands in the command queue.
   inline bool has_commands() const { return !command_queue_.IsEmpty(); }
   inline bool ignore_events() const { return is_suppressed_ || !is_active_; }
+  inline bool break_disabled() const {
+    return break_disabled_ || in_debug_event_listener_;
+  }
 
   void OnException(Handle<Object> exception, bool uncaught,
                    Handle<Object> promise);
@@ -592,6 +595,7 @@ class Debug {
   bool live_edit_enabled_;
   bool has_break_points_;
   bool break_disabled_;
+  bool in_debug_event_listener_;
   bool break_on_exception_;
   bool break_on_uncaught_exception_;
 
@@ -702,14 +706,21 @@ class DebugScope BASE_EMBEDDED {
 class DisableBreak BASE_EMBEDDED {
  public:
   explicit DisableBreak(Debug* debug, bool disable_break)
-    : debug_(debug), old_state_(debug->break_disabled_) {
+      : debug_(debug),
+        previous_break_disabled_(debug->break_disabled_),
+        previous_in_debug_event_listener_(debug->in_debug_event_listener_) {
     debug_->break_disabled_ = disable_break;
+    debug_->in_debug_event_listener_ = disable_break;
+  }
+  ~DisableBreak() {
+    debug_->break_disabled_ = previous_break_disabled_;
+    debug_->in_debug_event_listener_ = previous_in_debug_event_listener_;
   }
-  ~DisableBreak() { debug_->break_disabled_ = old_state_; }
 
  private:
   Debug* debug_;
-  bool old_state_;
+  bool previous_break_disabled_;
+  bool previous_in_debug_event_listener_;
   DISALLOW_COPY_AND_ASSIGN(DisableBreak);
 };