DevTools: implement release note behind an experiment

third_party/WebKit/Source/devtools/front_end/ui/InspectorView.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 209 matching lines @@
   }
 
   /**
    * @return {boolean}
    */
   isDrawerMinimized() {
     return this._drawerSplitWidget.isSidebarMinimized();
   }
 
   /**
+   * @param {string} id
+   * @param {boolean=} userGesture
+   */
+  closeDrawerTab(id, userGesture) {
+    this._drawerTabbedPane.closeTab(id, userGesture);
+  }
+
+  /**
    * @param {!Event} event
    */
   _keyDown(event) {
     var keyboardEvent = /** @type {!KeyboardEvent} */ (event);
     if (!UI.KeyboardShortcut.eventHasCtrlOrMeta(keyboardEvent) || event.altKey || event.shiftKey)
       return;
 
     // Ctrl/Cmd + 1-9 should show corresponding panel.
     var panelShortcutEnabled = Common.moduleSetting('shortcutPanelSwitch').get();
     if (panelShortcutEnabled) {
@@ skipping 87 matching lines @@
    * @return {boolean}
    */
   handleAction(context, actionId) {
     if (UI.inspectorView.drawerVisible())
       UI.inspectorView._closeDrawer();
     else
       UI.inspectorView._showDrawer(true);
     return true;
   }
 };