[Mac] Implement LocationBarViewMac::UpdateLocationBarVisibility()

chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm

Index: chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
diff --git a/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm b/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
index 3417aa77227ed47eeaa62d5e80332d1840949ade..be1fea1676fee3381f616e54f0fa98b09146a5e0 100644
--- a/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
+++ b/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
@@ -29,6 +29,7 @@
 #include "chrome/browser/translate/chrome_translate_client.h"
 #include "chrome/browser/translate/translate_service.h"
 #include "chrome/browser/ui/browser_list.h"
+#import "chrome/browser/ui/cocoa/browser_window_controller.h"
 #import "chrome/browser/ui/cocoa/content_settings/content_setting_bubble_cocoa.h"
 #import "chrome/browser/ui/cocoa/extensions/extension_popup_controller.h"
 #import "chrome/browser/ui/cocoa/first_run_bubble_controller.h"
@@ -46,6 +47,7 @@
 #import "chrome/browser/ui/cocoa/location_bar/translate_decoration.h"
 #import "chrome/browser/ui/cocoa/location_bar/zoom_decoration.h"
 #import "chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.h"
+#import "chrome/browser/ui/cocoa/toolbar/toolbar_controller.h"
 #include "chrome/browser/ui/content_settings/content_setting_bubble_model.h"
 #include "chrome/browser/ui/content_settings/content_setting_image_model.h"
 #include "chrome/browser/ui/passwords/manage_passwords_ui_controller.h"
@@ -199,7 +201,14 @@ void LocationBarViewMac::UpdateBookmarkStarVisibility() {
 
 void LocationBarViewMac::UpdateLocationBarVisibility(bool visible,
                                                      bool animate) {
-  // Not implemented on Mac.
+  // The location bar is held within the toolbar, so its visibility is
+  // controlled by the visibility of the toolbar. In turn, the toolbar
+  // visibility is controlled by the BWC. If we have requested a visibility
+  // change, ask the BWC for the current view to tell the toolbar controller
+  // to update.
+  [[[BrowserWindowController browserWindowControllerForView:field_]
+      toolbarController] updateVisibility:visible
+                            withAnimation:animate];
 }
 
 bool LocationBarViewMac::ShowPageActionPopup(