DevTools: add tooltip for truncated classnames and full name for title

third_party/WebKit/Source/devtools/front_end/components/RemoteObjectPreviewFormatter.js

 // Copyright (c) 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 /**
  * @unrestricted
  */
 Components.RemoteObjectPreviewFormatter = class {
   /**
    * @param {!Element} parentElement
    * @param {!Protocol.Runtime.ObjectPreview} preview
    */
   appendObjectPreview(parentElement, preview) {
     var description = preview.description;
     if (preview.type !== 'object' || preview.subtype === 'null') {
       parentElement.appendChild(this.renderPropertyPreview(preview.type, preview.subtype, description));
       return;
     }
-    if (description && preview.subtype !== 'array') {
-      var text = preview.subtype ? description : this._abbreviateFullQualifiedClassName(description);
-      parentElement.createTextChildren(text, ' ');
-    }
+    if (description && preview.subtype !== 'array')
+      parentElement.createTextChildren(description, ' ');
 
     var isArray = preview.subtype === 'array' || preview.subtype === 'typedarray';
     parentElement.createTextChild(isArray ? '[' : '{');
     if (preview.entries)
       this._appendEntriesPreview(parentElement, preview);
     else if (isArray)
       this._appendArrayPropertiesPreview(parentElement, preview);
     else
       this._appendObjectPropertiesPreview(parentElement, preview);
     if (preview.overflow)
@@ skipping 145 matching lines @@
       return span;
     }
 
     if (type === 'string') {
       span.createTextChildren('"', description.replace(/\n/g, '\u21B5'), '"');
       return span;
     }
 
     if (type === 'object' && !subtype) {
       span.textContent = this._abbreviateFullQualifiedClassName(description);
+      span.title = description;
       return span;
     }
 
     span.textContent = description;
     return span;
   }
 };