[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..74dae558480737154dfc484bf283517da99407ae 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"
@@ -103,6 +104,7 @@ LocationBarViewMac::LocationBarViewMac(AutocompleteTextField* field,
       manage_passwords_decoration_(
           new ManagePasswordsDecoration(command_updater, this)),
       browser_(browser),
+      visible_(true),
       weak_ptr_factory_(this) {
   for (ContentSettingsType type :
        ContentSettingBubbleModel::GetSupportedBubbleTypes()) {
@@ -199,7 +201,16 @@ 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.
+  if (visible != visible_) {
+    [[BrowserWindowController browserWindowControllerForView:field_]
+        updateToolbarVisibility:visible withAnimation:animate];

[tapted, 2015/10/12 23:56:43]

We should be able to find a way to call it directly here sorta like

[[BWC() toolbarController] updateVisibility:visible withAnimation:animate];

[dominickn, 2015/10/15 06:22:28]

Done.

+    visible_ = visible;
+  }
 }
 
 bool LocationBarViewMac::ShowPageActionPopup(