Update the bookmark tooltip text only when necessary

chrome/browser/ui/views/bookmarks/bookmark_bar_view.h

 // Copyright (c) 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_VIEWS_BOOKMARKS_BOOKMARK_BAR_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_BOOKMARKS_BOOKMARK_BAR_VIEW_H_
 
 #include <set>
 
 #include "base/compiler_specific.h"
@@ skipping 26 matching lines @@
 
 namespace bookmarks {
 class BookmarkModel;
 class ManagedBookmarkService;
 }
 
 namespace content {
 class PageNavigator;
 }
 
+namespace gfx {
+class FontList;
+}
+
 namespace views {
 class CustomButton;
 class MenuButton;
 class MenuItemView;
 class LabelButton;
 }
 
 // BookmarkBarView renders the BookmarkModel.  Each starred entry on the
 // BookmarkBar is rendered as a MenuButton. An additional MenuButton aligned to
 // the right allows the user to quickly see recently starred entries.
@@ skipping 78 matching lines @@
 
   // Returns the drop MenuItemView, or NULL if a menu isn't showing.
   views::MenuItemView* GetDropMenu();
 
   // If a button is currently throbbing, it is stopped. If immediate is true
   // the throb stops immediately, otherwise it stops after a couple more
   // throbs.
   void StopThrobbing(bool immediate);
 
   // Returns the tooltip text for the specified url and title. The returned
-  // text is clipped to fit within the bounds of the monitor. |context| is
-  // used to determine which display::Screen is used to retrieve bounds.
+  // text is clipped to fit |max_tooltip_width|.
   //
   // Note that we adjust the direction of both the URL and the title based on
   // the locale so that pure LTR strings are displayed properly in RTL locales.
-  static base::string16 CreateToolTipForURLAndTitle(const views::Widget* widget,
-                                              const gfx::Point& screen_loc,
-                                              const GURL& url,
-                                              const base::string16& title);
+  static base::string16 CreateToolTipForURLAndTitle(
+      int max_tooltip_width,
+      const gfx::FontList& font_list,
+      const GURL& url,
+      const base::string16& title);
 
   // Returns true if Bookmarks Bar is currently detached from the Toolbar.
   bool IsDetached() const;
 
   // Returns the current amount of overlap atop the browser toolbar.
   int GetToolbarOverlap() const;
 
   // views::View:
   gfx::Size GetPreferredSize() const override;
   gfx::Size GetMinimumSize() const override;
@@ skipping 294 matching lines @@
 
   base::ObserverList<BookmarkBarViewObserver> observers_;
 
   // Factory used to delay showing of the drop menu.
   base::WeakPtrFactory<BookmarkBarView> show_folder_method_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BookmarkBarView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_BOOKMARKS_BOOKMARK_BAR_VIEW_H_