[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 a72928503a1fde8b0108c8703c9b5da175e02c1c..d5c7f231ef000ecdf91f108423ad41935c6400e3 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
@@ -80,6 +80,13 @@ const static int kFirstRunBubbleYOffset = 1;
 
 }  // namespace
 
+namespace chrome {
+
+NSString* const kShowToolbarNotification = @"ShowToolbarNotification";
+NSString* const kHideToolbarNotification = @"HideToolbarNotification";
+
+}  // namespace chrome
+
 // TODO(shess): This code is mostly copied from the gtk
 // implementation.  Make sure it's all appropriate and flesh it out.
 
@@ -103,6 +110,7 @@ LocationBarViewMac::LocationBarViewMac(AutocompleteTextField* field,
       manage_passwords_decoration_(
           new ManagePasswordsDecoration(command_updater, this)),
       browser_(browser),
+      show_location_bar_(true),
       weak_ptr_factory_(this) {
   for (size_t i = 0; i < CONTENT_SETTINGS_NUM_TYPES; ++i) {
     DCHECK_EQ(i, content_setting_decorations_.size());
@@ -200,7 +208,15 @@ void LocationBarViewMac::UpdateBookmarkStarVisibility() {
 
 void LocationBarViewMac::UpdateLocationBarVisibility(bool visible,
                                                      bool animate) {
-  // Not implemented on Mac.
+  // TODO(dominickn): respect the |animate| value.
+  if (visible != show_location_bar_) {
+    [[NSNotificationCenter defaultCenter]

[tapted, 2015/09/08 05:55:06]

Something like

[[BrowserWindowController browserWindowControllerForView:[self view]]
setToolbarHidden:YES]; would probably be a lot nicer than the notifications. But
I don't think this is the way to go about it anyway.

[dominickn, 2015/10/09 06:37:02]

Done.

+        postNotificationName:(visible ? chrome::kShowToolbarNotification
+                                      : chrome::kHideToolbarNotification)
+        object:nil];
+    show_location_bar_ = visible;
+    [field_ setHidden:!visible];
+  }
 }
 
 bool LocationBarViewMac::ShowPageActionPopup(