DevTools: improve test infrastructure w/ devtools driving the test

third_party/WebKit/LayoutTests/http/tests/inspector/devtools-js/release-note.js

+// Copyright 2017 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.
+TestRunner.addResult("Test release note\n");
+
+Help.releaseNoteText = [
+  {
+    version: 99,
+    highlights: [
+      {
+        contents: [
+          {
+            text: 'Improved',
+          },
+          {
+            text: 'Performance and Memory panels',
+            link: 'https://developers.google.com/web/tools/chrome-devtools/',
+          }
+        ],
+        featured: true,
+      },
+      {
+        contents: [
+          {
+            text: 'Edit cookies directly',
+            link: 'https://developers.google.com/web/tools/chrome-devtools/',
+          },
+          {
+            text: 'from the Application panel',
+          },
+        ],
+      },
+    ],
+    link: 'https://developers.google.com/web/tools/chrome-devtools/',
+    image: {
+      src: './resources/test.png',
+    },
+  },
+];
+
+TestRunner.addSniffer(UI.inspectorView, "showPanel", onPanelShown);
+
+TestRunner.addResult(`Browser version: ${Help.browserVersion()}\n`);
+Help.showReleaseNoteIfNeeded();
+
+function onPanelShown(viewId, panelPromise) {
+  panelPromise.then(() => {
+    var releaseNoteView = UI.viewManager.view("release-note");
+    var releaseNoteElement = releaseNoteView[UI.View._widgetSymbol].contentElement;
+    TestRunner.addResult("Dumping release note text:");
+    TestRunner.addResult(releaseNoteElement.innerText);
+    TestRunner.addResult("Last version of release note seen should be updated:");
+    TestRunner.addResult(Help.releaseNoteVersionSetting().get() + "\n");
+
+    TestRunner.addSniffer(UI.InspectorView.prototype, "closeDrawerTab", onClose);
+    TestRunner.addResult("Click on hide button");
+    var closeButton = releaseNoteElement.querySelector(".close-release-note");
+    closeButton.click();
+  });
+}
+
+function onClose(view) {
+  TestRunner.addResult(`Hiding view: ${view}`);
+  TestRunner.completeTest();
+}