Allow keyboard shortcuts can be captured by webpage when toolbar is not visible

chrome/browser/ui/browser_window.h

 // Copyright 2012 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.
 
 #ifndef CHROME_BROWSER_UI_BROWSER_WINDOW_H_
 #define CHROME_BROWSER_UI_BROWSER_WINDOW_H_
 
 #include "base/callback_forward.h"
 #include "build/build_config.h"
 #include "chrome/browser/lifetime/browser_close_manager.h"
@@ skipping 202 matching lines @@
 
   // Returns whether the bookmark bar is visible or not.
   virtual bool IsBookmarkBarVisible() const = 0;
 
   // Returns whether the bookmark bar is animating or not.
   virtual bool IsBookmarkBarAnimating() const = 0;
 
   // Returns whether the tab strip is editable (for extensions).
   virtual bool IsTabStripEditable() const = 0;
 
-  // Returns whether the tool bar is visible or not.
+  // Returns whether the toolbar is available or not. It's called "Visible()"
+  // to follow the name convention. But it does not indicate the visibility of
+  // the toolbar, i.e. toolbar may be hidden, and only visible when the mouse
+  // cursor is at a certain place.
+  // TODO(zijiehe): Rename Visible() functions into Available() to match their
+  // original meaning.
   virtual bool IsToolbarVisible() const = 0;
 
+  // Returns whether the toolbar is showing up on the screen.
+  virtual bool IsToolbarShowing() const = 0;
+
   // Shows the Update Recommended dialog box.
   virtual void ShowUpdateChromeDialog() = 0;
 
   // Shows the Bookmark bubble. |url| is the URL being bookmarked,
   // |already_bookmarked| is true if the url is already bookmarked.
   virtual void ShowBookmarkBubble(const GURL& url, bool already_bookmarked) = 0;
 
   // Callback type used with the ShowBookmarkAppBubble() method. The boolean
   // parameter is true when the user accepts the dialog. The WebApplicationInfo
   // parameter contains the WebApplicationInfo as edited by the user.
@@ skipping 143 matching lines @@
   virtual std::string GetWorkspace() const = 0;
   virtual bool IsVisibleOnAllWorkspaces() const = 0;
 
  protected:
   friend class BrowserCloseManager;
   friend class BrowserView;
   virtual void DestroyBrowser() = 0;
 };
 
 #endif  // CHROME_BROWSER_UI_BROWSER_WINDOW_H_