DevTools: Show docs link on empty manifest landing page

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

Index: third_party/WebKit/Source/devtools/front_end/ui/EmptyWidget.js
diff --git a/third_party/WebKit/Source/devtools/front_end/ui/EmptyWidget.js b/third_party/WebKit/Source/devtools/front_end/ui/EmptyWidget.js
index 94bde9264dcb20808450c9ca5ee0ca292925bb3a..8054bc3580b18a158fea0cdddc619e3858fe0711 100644
--- a/third_party/WebKit/Source/devtools/front_end/ui/EmptyWidget.js
+++ b/third_party/WebKit/Source/devtools/front_end/ui/EmptyWidget.js
@@ -32,12 +32,19 @@
  * @unrestricted
  */
 UI.EmptyWidget = class extends UI.VBox {
-  constructor(text) {
+  /**
+   * @param {string} text
+   * @param {?Element=} descElement
+   */
+  constructor(text, descElement) {
     super();
     this.registerRequiredCSS('ui/emptyWidget.css');
     this.element.classList.add('empty-view');
-    this.textElement = this.element.createChild('span');
+    this.textElement = this.element.createChild('h2');
+    this.descWrapperElement = this.element.createChild('div', 'empty-view-description');
+
     this._text = text;
+    this._descElement = descElement;
   }
 
   /**
@@ -45,8 +52,15 @@ UI.EmptyWidget = class extends UI.VBox {
    */
   wasShown() {
     this.textElement.textContent = this._text;
+    if (this._descElement) {

[pfeldman, 2017/02/15 19:57:02]

Just have it there, no need to mutate upon wasShown. Same for textElement, I'd
just set textContent on the textElement.

[paulirish, 2017/02/23 01:49:30]

Latest patch doesn't hold onto _text, but instead just sets textContent
immediately. wfy?

+      this.descWrapperElement.removeChildren();
+      this.descWrapperElement.appendChild(this._descElement);
+    }
   }
 
+  /**
+   * @param {string} text
+   */
   set text(text) {
     this._text = text;
     if (this.isShowing())