Update Mac notification tray behavior.

chrome/browser/ui/cocoa/notifications/message_center_tray_bridge.mm

 // Copyright (c) 2013 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.
 
 #include "chrome/browser/ui/cocoa/notifications/message_center_tray_bridge.h"
 
 #include "base/bind.h"
 #include "base/i18n/number_formatting.h"
 #include "base/message_loop/message_loop.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 58 matching lines @@
   base::MessageLoop::current()->PostTask(FROM_HERE,
       base::Bind(&MessageCenterTrayBridge::OpenTrayWindow,
                  weak_ptr_factory_.GetWeakPtr()));
   return true;
 }
 
 void MessageCenterTrayBridge::HideMessageCenter() {
   [status_item_view_ setHighlight:NO];
   [tray_controller_ close];
   tray_controller_.autorelease();
+  UpdateStatusItem();
 }
 
 bool MessageCenterTrayBridge::ShowNotifierSettings() {
   // This method needs to be implemented when the context menu of each
   // notification is ready and it contains 'settings' menu item.
   return false;
 }
 
 void MessageCenterTrayBridge::UpdateStatusItem() {
-  // Only show the status item if there are notifications.
-  if (message_center_->NotificationCount() == 0) {
-    [status_item_view_ removeItem];
-    status_item_view_.reset();
-    return;
-  }
-
   if (!status_item_view_) {
     status_item_view_.reset([[MCStatusItemView alloc] init]);
     [status_item_view_ setCallback:^{ tray_->ToggleMessageCenterBubble(); }];
   }
 
+  // We want a static message center icon while it's visible.
+  if (message_center()->IsMessageCenterVisible())
+    return;
+
   size_t unread_count = message_center_->UnreadNotificationCount();
-  [status_item_view_ setUnreadCount:unread_count];
+  bool quiet_mode = message_center_->IsQuietMode();
+  [status_item_view_ setUnreadCount:unread_count withQuietMode:quiet_mode];
 
   string16 product_name = l10n_util::GetStringUTF16(IDS_SHORT_PRODUCT_NAME);
   if (unread_count > 0) {
     string16 unread_count_string = base::FormatNumber(unread_count);
     [status_item_view_ setToolTip:
         l10n_util::GetNSStringF(IDS_MESSAGE_CENTER_TOOLTIP_UNREAD,
             product_name, unread_count_string)];
   } else {
     [status_item_view_ setToolTip:
         l10n_util::GetNSStringF(IDS_MESSAGE_CENTER_TOOLTIP, product_name)];
   }
 }
 
 void MessageCenterTrayBridge::OpenTrayWindow() {
   DCHECK(!tray_controller_);
   tray_controller_.reset(
       [[MCTrayController alloc] initWithMessageCenterTray:tray_.get()]);
 
   UpdateStatusItem();
 
   [status_item_view_ setHighlight:YES];
   NSRect frame = [[status_item_view_ window] frame];
   [tray_controller_ showTrayAtRightOf:NSMakePoint(NSMinX(frame),
                                                   NSMinY(frame))
                              atLeftOf:NSMakePoint(NSMaxX(frame),
                                                   NSMinY(frame))];
 }