DevTools: implement release note behind an experiment

third_party/WebKit/Source/devtools/front_end/console/ConsoleView.js

 /*
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 19 matching lines @@
  * @implements {UI.Searchable}
  * @implements {SDK.TargetManager.Observer}
  * @implements {Console.ConsoleViewportProvider}
  * @unrestricted
  */
 Console.ConsoleView = class extends UI.VBox {
   constructor() {
     super();
     this.setMinimumSize(0, 35);
     this.registerRequiredCSS('console/consoleView.css');
+    this.registerRequiredCSS('console/releaseNoteMessage.css');

[luoe, 2017/02/11 00:30:54]

Could we move releaseNoteMessage.css into the help module?

 
     this._searchableView = new UI.SearchableView(this);
     this._searchableView.setPlaceholder(Common.UIString('Find string in logs'));
     this._searchableView.setMinimalSearchQuerySize(0);
     this._searchableView.show(this.element);
 
     this._contentsElement = this._searchableView.element;
     this._contentsElement.classList.add('console-view');
     /** @type {!Array.<!Console.ConsoleViewMessage>} */
     this._visibleViewMessages = [];
@@ skipping 77 matching lines @@
 
     this._registerShortcuts();
 
     this._messagesElement.addEventListener('contextmenu', this._handleContextMenuEvent.bind(this), false);
     Common.moduleSetting('monitoringXHREnabled').addChangeListener(this._monitoringXHREnabledSettingChanged, this);
 
     this._linkifier = new Components.Linkifier();
 
     /** @type {!Array.<!Console.ConsoleViewMessage>} */
     this._consoleMessages = [];
+
+    this._releaseNoteManager = new Help.ReleaseNoteManager();
+    if (!Host.isUnderTest())
+      this._addReleaseNote();
     this._viewMessageSymbol = Symbol('viewMessage');
 
     this._consoleHistorySetting = Common.settings.createLocalSetting('consoleHistory', []);
 
     this._prompt = new Console.ConsolePrompt();
     this._prompt.show(this._promptElement);
     this._prompt.element.addEventListener('keydown', this._promptKeyDown.bind(this), true);
 
     this._consoleHistoryAutocompleteSetting = Common.moduleSetting('consoleHistoryAutocomplete');
     this._consoleHistoryAutocompleteSetting.addChangeListener(this._consoleHistoryAutocompleteChanged, this);
@@ skipping 34 matching lines @@
     }
   }
 
   /**
    * @return {!UI.SearchableView}
    */
   searchableView() {
     return this._searchableView;
   }
 
+  /**
+   * @param {number} version
+   */
+  removeReleaseNote(version) {
+    this._consoleMessages = this._consoleMessages.filter(
+        message => message.consoleMessage().level !== SDK.ConsoleMessage.MessageLevel.Note);
+    this._releaseNoteManager.sawReleaseNote(version);
+    this._updateMessageList();
+  }
+
+  /**
+   * @param {number} version
+   */
+  sawReleaseNote(version) {
+    this._releaseNoteManager.sawReleaseNote(version);
+  }
+
+  _addReleaseNote() {
+    var releaseNote = this._releaseNoteManager.maybeGetReleaseNote();
+    if (releaseNote)
+      this._addConsoleMessage(releaseNote);
+  }
+
   _clearHistory() {
     this._consoleHistorySetting.set([]);
     this._prompt.history().setHistoryData([]);
   }
 
   _consoleHistoryAutocompleteChanged() {
     this._prompt.setAddCompletionsFromHistory(this._consoleHistoryAutocompleteSetting.get());
   }
 
   _initConsoleMessages() {
@@ skipping 1113 matching lines @@
         return true;
     }
     return false;
   }
 };
 
 /**
  * @typedef {{messageIndex: number, matchIndex: number}}
  */
 Console.ConsoleView.RegexMatchRange;