DevTools: Decouple shortcuts from actions, introduce shortcut contexts

Source/devtools/front_end/Drawer.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 142 matching lines @@
     closeDrawer: function()
     {
         if (!this.isShowing())
             return;
 
         WebInspector.restoreFocusFromElement(this.element);
         this._splitView.hideSidebar(true);
     },
 
     /**
-     * @return {!WebInspector.View} view
+     * @return {?WebInspector.View} view
      */
     _visibleView: function()
     {
         return this._tabbedPane.visibleView;
     },
 
     /**
      * @param {!WebInspector.Event} event
      */
     _tabSelected: function(event)
     {
         var tabId = this._tabbedPane.selectedTabId;
-        if (event.data["isUserGesture"] && !this._tabbedPane.isTabCloseable(tabId))
+        if (tabId && event.data["isUserGesture"] && !this._tabbedPane.isTabCloseable(tabId))
             this._lastSelectedViewSetting.set(tabId);
     },
 
     toggle: function()
     {
         if (this._toggleDrawerButton.toggled)
             this.closeDrawer();
         else
             this.showDrawer();
     },
 
     /**
      * @return {boolean}
      */
     visible: function()
     {
         return this._toggleDrawerButton.toggled;
     },
 
     /**
-     * @return {string}
+     * @return {?string}
      */
     selectedViewId: function()
     {
         return this._tabbedPane.selectedTabId;
     },
 
     /**
      * @param {!WebInspector.Event} event
      */
     _drawerEditorSplitViewShowModeChanged: function(event)
@@ skipping 116 matching lines @@
 }
 
 WebInspector.DrawerEditor.prototype = {
     /**
      * @return {!WebInspector.View}
      */
     view: function() { },
 
     installedIntoDrawer: function() { },
 }