Fix popup crash on ChromeOS.

The popup collection was not handling correctly the case where it tells
the message center to mark its popups read, causing a NOTREACHED in
observer list.

BUG=324142

Review URL: https://codereview.chromium.org/99543003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238515 0039d316-1c4b-4281-b951-d872f2087c98

ash/system/web_notification/web_notification_tray.cc

@@ -416,6 +416,9 @@ bool WebNotificationTray::ShowPopups() {
 }
 
 void WebNotificationTray::HidePopups() {
+  DCHECK(popup_collection_.get());
+
+  popup_collection_->MarkAllPopupsShown();
   popup_collection_.reset();
   work_area_observer_->StopObserving();
 }

ash/system/web_notification/web_notification_tray_unittest.cc

@@ -208,6 +208,16 @@ TEST_F(WebNotificationTrayTest, WebNotificationPopupBubble) {
   // Removing the visible notification should hide the popup bubble.
   RemoveNotification("test_id3");
   EXPECT_FALSE(GetTray()->IsPopupVisible());
+
+  // Now test that we can show multiple popups and then show the message center.
+  AddNotification("test_id4");
+  AddNotification("test_id5");
+  EXPECT_TRUE(GetTray()->IsPopupVisible());
+
+  GetTray()->message_center_tray_->ShowMessageCenterBubble();
+  GetTray()->message_center_tray_->HideMessageCenterBubble();
+
+  EXPECT_FALSE(GetTray()->IsPopupVisible());
 }
 
 using message_center::NotificationList;

chrome/browser/ui/views/message_center/web_notification_tray.cc

@@ -152,7 +152,12 @@ bool WebNotificationTray::ShowPopups() {
   return true;
 }
 
-void WebNotificationTray::HidePopups() { popup_collection_.reset(); }
+void WebNotificationTray::HidePopups() {
+  DCHECK(popup_collection_.get());
+
+  popup_collection_->MarkAllPopupsShown();
+  popup_collection_.reset();
+}
 
 bool WebNotificationTray::ShowMessageCenter() {
   message_center_delegate_ =

ui/message_center/message_center_tray.cc

@@ -102,11 +102,8 @@ void MessageCenterTray::HidePopupBubbleInternal() {
   if (!popups_visible_)
     return;
 
-  // This is called before HidePopups so that we don't double-call this when we
-  // see the results of HidePopups via MessageCenterObserver.
-  popups_visible_ = false;
-
   delegate_->HidePopups();
+  popups_visible_ = false;
 }
 
 void MessageCenterTray::ShowNotifierSettingsBubble() {

ui/message_center/views/message_popup_collection.cc

@@ -101,6 +101,10 @@ MessagePopupCollection::~MessagePopupCollection() {
   screen->RemoveObserver(this);
   message_center_->RemoveObserver(this);
 
+  CloseAllWidgets();
+}
+
+void MessagePopupCollection::MarkAllPopupsShown() {
   std::set<std::string> closed_ids = CloseAllWidgets();
   for (std::set<std::string>::iterator iter = closed_ids.begin();
        iter != closed_ids.end(); iter++) {

ui/message_center/views/message_popup_collection.h

@@ -68,6 +68,8 @@ class MESSAGE_CENTER_EXPORT MessagePopupCollection
                          bool first_item_has_no_margin);
   virtual ~MessagePopupCollection();
 
+  void MarkAllPopupsShown();
+
   // Since these events are really coming from individual toast widgets,
   // it helps to be able to keep track of the sender.
   void OnMouseEntered(ToastContentsView* toast_entered);