[Mac] Retain location bar focus on switching to fullscreen and back.

chrome/browser/ui/cocoa/toolbar/toolbar_controller.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_COCOA_TOOLBAR_TOOLBAR_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_TOOLBAR_TOOLBAR_CONTROLLER_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include <memory>
@@ skipping 102 matching lines @@
 
 // Called by the Window delegate so we can provide a custom field editor if
 // needed.
 // Note that this may be called for objects unrelated to the toolbar.
 // returns nil if we don't want to override the custom field editor for |obj|.
 - (id)customFieldEditorForObject:(id)obj;
 
 // Called by the |locationBar_| when it has been added to its window.
 - (void)locationBarWasAddedToWindow;
 
+// Return YES if the location bar is the first responder.
+- (BOOL)locationBarHasFocus;
+
 // Make the location bar the first responder, if possible.
 - (void)focusLocationBar:(BOOL)selectAll;
 
 // Called by CommandObserverBridge when there is a state change for the given
 // command.
 - (void)enabledStateChangedForCommand:(int)command enabled:(bool)enabled;
 
 // Forces the toolbar (and transitively the location bar) to update its current
 // state.  If |tab| is non-NULL, we're switching (back?) to this tab and should
 // restore any previous location bar state (such as user editing) as well.
@@ skipping 69 matching lines @@
 - (void)installAppMenu;
 // Return a hover button for the current event.
 - (NSButton*)hoverButtonForEvent:(NSEvent*)theEvent;
 // Adjusts browser actions container view in response to toolbar frame changes.
 // Outside of tests, called in response to frame changed/new window
 // notifications.
 - (void)toolbarFrameChanged;
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_TOOLBAR_TOOLBAR_CONTROLLER_H_