DevTools: Show docs link on empty manifest landing page

third_party/WebKit/Source/devtools/front_end/ui/EmptyWidget.js

 /*
  * Copyright (C) 2011 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 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 /**
  * @unrestricted
  */
 UI.EmptyWidget = class extends UI.VBox {
+  /**
+   * @param {string} text
+   */
   constructor(text) {
     super();
     this.registerRequiredCSS('ui/emptyWidget.css');
     this.element.classList.add('empty-view');
-    this.textElement = this.element.createChild('span');
-    this._text = text;
+    this.textElement = this.element.createChild('h2');
+    this.textElement.textContent = text;
   }
 
   /**
-   * @override
+   * @return {!Element}
    */
-  wasShown() {
-    this.textElement.textContent = this._text;
+  appendParagraph() {
+    return this.element.createChild('p');
   }
 
+  /**
+   * @param {string} text
+   */
   set text(text) {
-    this._text = text;
-    if (this.isShowing())
-      this.textElement.textContent = this._text;
+    this.textElement.textContent = text;
   }
 };