Adding Discarded property support for onUpdate function.

chrome/browser/extensions/api/tabs/tabs_event_router.cc

 // Copyright 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/extensions/api/tabs/tabs_event_router.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "base/values.h"
+#include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/api/tabs/tabs_constants.h"
 #include "chrome/browser/extensions/api/tabs/tabs_windows_api.h"
 #include "chrome/browser/extensions/api/tabs/windows_event_router.h"
 #include "chrome/browser/extensions/extension_tab_util.h"
+#include "chrome/browser/memory/tab_manager.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "components/favicon/content/content_favicon_driver.h"
 #include "content/public/browser/favicon_status.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/web_contents.h"
 
@@ skipping 100 matching lines @@
   // and then destroyed without ever having been re-attached and closed. This
   // happens in the case of a devtools WebContents that is opened in window,
   // docked, then closed.
   // Warning: |this| will be deleted after this call.
   router_->UnregisterForTabNotifications(web_contents());
 }
 
 TabsEventRouter::TabsEventRouter(Profile* profile)
     : profile_(profile),
       favicon_scoped_observer_(this),
-      browser_tab_strip_tracker_(this, this, this) {
+      browser_tab_strip_tracker_(this, this, this),
+      tab_manager_scoped_observer_(this) {
   DCHECK(!profile->IsOffTheRecord());
 
   browser_tab_strip_tracker_.Init(
       BrowserTabStripTracker::InitWith::ALL_BROWERS);
+
+  tab_manager_scoped_observer_.Add(g_browser_process->GetTabManager());
 }
 
 TabsEventRouter::~TabsEventRouter() {
 }
 
 bool TabsEventRouter::ShouldTrackBrowser(Browser* browser) {
   return profile_->IsSameProfile(browser->profile()) &&
          ExtensionTabUtil::BrowserSupportsTabs(browser);
 }
 
@@ skipping 392 matching lines @@
     const GURL& icon_url,
     bool icon_url_changed,
     const gfx::Image& image) {
   if (notification_icon_type == NON_TOUCH_16_DIP && icon_url_changed) {
     favicon::ContentFaviconDriver* content_favicon_driver =
         static_cast<favicon::ContentFaviconDriver*>(favicon_driver);
     FaviconUrlUpdated(content_favicon_driver->web_contents());
   }
 }
 
+void TabsEventRouter::OnDiscardedStateChange(WebContents* contents,
+                                             bool is_discarded) {
+  TabStripModel* tab_strip = nullptr;
+  int tab_index = -1;
+
+  if (ExtensionTabUtil::GetTabStripModel(contents, &tab_strip, &tab_index)) {
+    std::set<std::string> changed_property_names;
+    changed_property_names.insert(tabs_constants::kDiscardedKey);
+    DispatchTabUpdatedEvent(contents, std::move(changed_property_names));
+  }
+}
+
 }  // namespace extensions