[inspector] async stacks for Promise.then calls...

src/debug/debug.js

Index: src/debug/debug.js
diff --git a/src/debug/debug.js b/src/debug/debug.js
index 110ce9590fe20cfd567409a5572159b7e8aaecdb..c17a20a512a655e95e788f3141a453523e8828b8 100644
--- a/src/debug/debug.js
+++ b/src/debug/debug.js
@@ -1094,21 +1094,12 @@ function PromiseDebugActionNameToString(name) {
     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";
+    case kDebugPromiseCollected: return "Promise collected";
   }
 }
 
 function MakeAsyncTaskEvent(type, id, name) {
-  return new AsyncTaskEvent(PromiseDebugActionTypeToString(type),
+  return new AsyncTaskEvent(type,
                             id, PromiseDebugActionNameToString(name));
 }