Introduce debug events for promises.

src/debug-debugger.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Default number of frames to include in the response to backtrace request.
 var kDefaultBacktraceLength = 10;
 
 var Debug = {};
 
 // Regular expression to skip "crud" at the beginning of a source line which is
 // not really code. Currently the regular expression matches whitespace and
 // comments.
 var sourceLineBeginningSkip = /^(?:\s*(?:\/\*.*?\*\/)*)*/;
 
 // Debug events which can occour in the V8 JavaScript engine. These originate
 // from the API include file debug.h.
 Debug.DebugEvent = { Break: 1,
                      Exception: 2,
                      NewFunction: 3,
                      BeforeCompile: 4,
                      AfterCompile: 5,
-                     CompileError: 6 };
+                     CompileError: 6,
+                     PromiseEvent: 7 };
 
 // Types of exceptions that can be broken upon.
 Debug.ExceptionBreak = { Caught : 0,
                          Uncaught: 1 };
 
 // The different types of steps.
 Debug.StepAction = { StepOut: 0,
                      StepNext: 1,
                      StepIn: 2,
                      StepMin: 3,
@@ skipping 1159 matching lines @@
   if (!IS_UNDEFINED(script.data())) {
     o.data = script.data();
   }
   if (include_source) {
     o.source = script.source();
   }
   return o;
 }
 
 
+function MakePromiseEvent(event_data) {
+  if (event_data.type = "new Promise") {
+    return new NewPromiseEvent(event_data);
+  }
+}
+
+
+function PromiseGetter() {
+  return MakeMirror(this.promise_);
+}
+
+
+function NewPromiseEvent(event_data) {
+  this.resolver_ = event_data.resolver;
+  this.promise_ = event_data.promise;
+}
+
+
+NewPromiseEvent.prototype.promise = PromiseGetter;
+
+
+NewPromiseEvent.prototype.resolver = function() {
+  return MakeMirror(this.resolver_);
+}
+
+
 function DebugCommandProcessor(exec_state, opt_is_running) {
   this.exec_state_ = exec_state;
   this.running_ = opt_is_running || false;
 }
 
 
 DebugCommandProcessor.prototype.processDebugRequest = function (request) {
   return this.processDebugJSONRequest(request);
 };
 
@@ skipping 1301 matching lines @@
 
     default:
       json = null;
   }
   return json;
 }
 
 Debug.TestApi = {
   CommandProcessorResolveValue: DebugCommandProcessor.resolveValue_
 };