[promises] Refactor debug code

src/debug/debug.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.
 
 (function (global, utils) {
 "use strict";
 
 // ----------------------------------------------------------------------------
 // Imports
 
@@ skipping 1070 matching lines @@
   if (!IS_UNDEFINED(script.data())) {
     o.data = script.data();
   }
   if (include_source) {
     o.source = script.source();
   }
   return o;
 }
 
 
+function PromiseDebugActionNameToString(name) {
+  switch (name) {
+    case kAsyncFunction: return "async function";
+    case kPromiseResolve: return "Promise.resolve";
+    case kPromiseReject: return "Promise.reject";
+    case kPromiseResolveThenableJob: return "PromiseResolveThenableJob";
+  }
+}
+
+function PromiseDebugActionTypeToString(type) {
+  switch (type) {
+    case kEnqueue: return "enqueue";
+    case kEnqueueRecurring: return "enqueueRecurring";
+    case kCancel: return "cancel";
+    case kWillHandle: return "willHandle";
+    case kDidHandle: return "didHandle";
+  }
+}
+
 function MakeAsyncTaskEvent(type, id, name) {
-  return new AsyncTaskEvent(type, id, name);
+  return new AsyncTaskEvent(PromiseDebugActionTypeToString(type),
+                            id, PromiseDebugActionNameToString(name));
 }
 
 
 function AsyncTaskEvent(type, id, name) {
   this.type_ = type;
   this.id_ = id;
   this.name_ = name;
 }
 
 
@@ skipping 1287 matching lines @@
 utils.InstallFunctions(utils, DONT_ENUM, [
   "MakeExecutionState", MakeExecutionState,
   "MakeExceptionEvent", MakeExceptionEvent,
   "MakeBreakEvent", MakeBreakEvent,
   "MakeCompileEvent", MakeCompileEvent,
   "MakeAsyncTaskEvent", MakeAsyncTaskEvent,
   "IsBreakPointTriggered", IsBreakPointTriggered,
 ]);
 
 })