[Mac] Implement LocationBarViewMac::UpdateLocationBarVisibility()

chrome/browser/ui/cocoa/browser_window_controller.mm

Index: chrome/browser/ui/cocoa/browser_window_controller.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller.mm b/chrome/browser/ui/cocoa/browser_window_controller.mm
index 776e2033d5f138cd7388f0b09a70770fbc831dc5..a9642e2d0058ea8139f6c382f34774cb2a77b3de 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller.mm
@@ -326,6 +326,7 @@ using content::WebContents;
                  browser:browser]);
     [toolbarController_ setHasToolbar:[self hasToolbar]
                        hasLocationBar:[self hasLocationBar]];
+    shouldShowToolbar_ = YES;
 
     // Create a sub-controller for the bookmark bar.
     bookmarkBarController_.reset(
@@ -407,6 +408,18 @@ using content::WebContents;
                 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.