[Mac] Implement LocationBarViewMac::UpdateLocationBarVisibility()

chrome/browser/ui/cocoa/browser_window_controller.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 
 #include <cmath>
 #include <numeric>
 
 #include "base/command_line.h"
@@ skipping 308 matching lines @@
     // Create a controller for the toolbar, giving it the toolbar model object
     // and the toolbar view from the nib. The controller will handle
     // registering for the appropriate command state changes from the back-end.
     // Adds the toolbar to the content area.
     toolbarController_.reset([[ToolbarController alloc]
         initWithCommands:browser->command_controller()->command_updater()
                  profile:browser->profile()
                  browser:browser]);
     [toolbarController_ setHasToolbar:[self hasToolbar]
                        hasLocationBar:[self hasLocationBar]];
+    shouldShowToolbar_ = YES;
 
     // Create a sub-controller for the bookmark bar.
     bookmarkBarController_.reset(
         [[BookmarkBarController alloc]
             initWithBrowser:browser_.get()
                initialWidth:NSWidth([[[self window] contentView] frame])
                    delegate:self
              resizeDelegate:self]);
     [bookmarkBarController_ setBookmarkBarEnabled:[self supportsBookmarkBar]];
 
@@ skipping 61 matching lines @@
          addObserver:self
             selector:@selector(applicationDidHide:)
                 name:NSApplicationDidHideNotification
               object:nil];
     [[NSNotificationCenter defaultCenter]
          addObserver:self
             selector:@selector(applicationDidUnhide:)
                 name:NSApplicationDidUnhideNotification
               object:nil];
 
+    // Register for toolbar visibility notifications from LocationBarViewMac.
+    [[NSNotificationCenter defaultCenter]
+         addObserver:self
+            selector:@selector(showToolbar:)
+                name:chrome::kShowToolbarNotification
+              object:nil];
+    [[NSNotificationCenter defaultCenter]
+         addObserver:self
+            selector:@selector(hideToolbar:)
+                name:chrome::kHideToolbarNotification
+              object:nil];
+
     // This must be done after the view is added to the window since it relies
     // on the window bounds to determine whether to show buttons or not.
     if ([self hasToolbar])  // Do not create the buttons in popups.
       [toolbarController_ createBrowserActionButtons];
 
     extension_keybinding_registry_.reset(
         new ExtensionKeybindingRegistryCocoa(browser_->profile(),
             [self window],
             extensions::ExtensionKeybindingRegistry::ALL_EXTENSIONS,
             windowShim_.get()));
@@ skipping 1855 matching lines @@
 
 - (BOOL)supportsBookmarkBar {
   return [self supportsWindowFeature:Browser::FEATURE_BOOKMARKBAR];
 }
 
 - (BOOL)isTabbedWindow {
   return browser_->is_type_tabbed();
 }
 
 @end  // @implementation BrowserWindowController(WindowType)