[DevTools] Show an empty Manifest view if no manifest

third_party/WebKit/Source/devtools/front_end/resources/AppManifestView.js

Index: third_party/WebKit/Source/devtools/front_end/resources/AppManifestView.js
diff --git a/third_party/WebKit/Source/devtools/front_end/resources/AppManifestView.js b/third_party/WebKit/Source/devtools/front_end/resources/AppManifestView.js
index 78f853092f5d751e2f9a983d861050e1675b7923..bf2d4dfbc81a309f49907940e658b4bb5a4bd5fa 100644
--- a/third_party/WebKit/Source/devtools/front_end/resources/AppManifestView.js
+++ b/third_party/WebKit/Source/devtools/front_end/resources/AppManifestView.js
@@ -1,10 +1,6 @@
 // Copyright (c) 2016 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.
-/**
- * @implements {SDK.TargetManager.Observer}
- * @unrestricted
- */
 Resources.AppManifestView = class extends UI.VBox {
   constructor() {
     super(true);
@@ -40,39 +36,6 @@ Resources.AppManifestView = class extends UI.VBox {
 
     this._orientationField = this._presentationSection.appendField(Common.UIString('Orientation'));
     this._displayField = this._presentationSection.appendField(Common.UIString('Display'));
-
-    SDK.targetManager.observeTargets(this, SDK.Target.Capability.DOM);
-  }
-
-  /**
-   * @override
-   * @param {!SDK.Target} target
-   */
-  targetAdded(target) {
-    if (this._resourceTreeModel)
-      return;
-    var resourceTreeModel = SDK.ResourceTreeModel.fromTarget(target);
-    if (!resourceTreeModel)
-      return;
-    this._resourceTreeModel = resourceTreeModel;
-    this._updateManifest();
-    resourceTreeModel.addEventListener(SDK.ResourceTreeModel.Events.MainFrameNavigated, this._updateManifest, this);
-  }
-
-  /**
-   * @override
-   * @param {!SDK.Target} target
-   */
-  targetRemoved(target) {
-    var resourceTreeModel = SDK.ResourceTreeModel.fromTarget(target);
-    if (!this._resourceTreeModel || this._resourceTreeModel !== resourceTreeModel)
-      return;
-    resourceTreeModel.removeEventListener(SDK.ResourceTreeModel.Events.MainFrameNavigated, this._updateManifest, this);
-    delete this._resourceTreeModel;
-  }
-
-  _updateManifest() {
-    this._resourceTreeModel.fetchAppManifest(this._renderManifest.bind(this));
   }
 
   /**
@@ -80,8 +43,9 @@ Resources.AppManifestView = class extends UI.VBox {
    * @param {?string} data
    * @param {!Array<!Protocol.Page.AppManifestError>} errors
    */
-  _renderManifest(url, data, errors) {
-    this._reportView.setURL(Components.Linkifier.linkifyURL(url));
+  renderManifest(url, data, errors) {
+    // This needs to run after the Linkifier listener processes target added event
+    setTimeout(() => this._reportView.setURL(Components.Linkifier.linkifyURL(url)));
     this._errorsSection.clearContent();
     this._errorsSection.element.classList.toggle('hidden', !errors.length);
     for (var error of errors) {