Support cmd-left/right for history.

chrome/browser/cocoa/chrome_browser_window.h

 // Copyright (c) 2009 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_COCOA_CHROME_BROWSER_WINDOW_H_
 #define CHROME_BROWSER_COCOA_CHROME_BROWSER_WINDOW_H_
 
 #import <Cocoa/Cocoa.h>
 
 // Cocoa class representing a Chrome browser window.
 // We need to override NSWindow with our own class since we need access to all
 // unhandled keyboard events and subclassing NSWindow is the only method to do
 // this.
 @interface ChromeBrowserWindow : NSWindow {
   BOOL shouldHideTitle_;
 }
 
+// See global_keyboard_shortcuts_mac.h for details on the next two functions.
+
+// Checks if |event| is a window keyboard shortcut. If so, dispatches it to the
+// window controller's |executeCommand:| and returns |YES|.
+- (BOOL)handleExtraWindowKeyboardShortcut:(NSEvent*)event;
+
+// Checks if |event| is a browser keyboard shortcut. If so, dispatches it to the
+// window controller's |executeCommand:| and returns |YES|.
+- (BOOL)handleExtraBrowserKeyboardShortcut:(NSEvent*)event;
+
 // Override, so we can handle global keyboard events.
 - (BOOL)performKeyEquivalent:(NSEvent*)theEvent;
 
 // Tells the window to suppress title drawing.
 - (void)setShouldHideTitle:(BOOL)flag;
 
 @end
 
 @interface ChromeBrowserWindow (UndocumentedAPI)
 
 // Undocumented Cocoa API to suppress drawing of the window's title.
 // -setTitle: still works, but the title set only applies to the
 // miniwindow and menus (and, importantly, Expose).  Overridden to
 // return |shouldHideTitle_|.
 -(BOOL)_isTitleHidden;
 
 @end
 
 #endif  // CHROME_BROWSER_COCOA_CHROME_BROWSER_WINDOW_H_