[DevTools] Report error in debug mode from promise with stack

Source/devtools/front_end/Runtime.js

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 969 matching lines @@
  */
 Promise.prototype.thenOrCatch = function(callback)
 {
     return this.then(callback, reject);
 
     /**
      * @param {*} e
      */
     function reject(e)
     {
-        console.error(e);
+        if (e instanceof Error)
+            console.error(e.stack);
+        else
+            console.error(e);
         callback();
     }
 }
 
 Promise.prototype.done = function()
 {
-    this.catch(console.error.bind(console));
+    /**
+     * @param {*} e
+     */
+    function reportError(e)
+    {
+        if (e instanceof Error)
+            console.error(e.stack);
+        else
+            console.error(e);
+    }
+    this.catch(reportError);
 }
 
 /**
  * @param {!Array.<!Promise.<T, !Error>>} promises
  * @return {!Promise.<!Array.<T>>}
  * @template T
  */
 Promise.some = function(promises)
 {
     var all = [];
@@ skipping 30 matching lines @@
         wasRejected[index] = true;
         console.error(e);
     }
 }
 
 // This must be constructed after the query parameters have been parsed.
 Runtime.experiments = new Runtime.ExperimentsSupport();
 
 /** @type {!Runtime} */
 var runtime;