AutoDiscardable property support on Chrome Extensions Tabs API.

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>
@@ skipping 551 matching lines @@
   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));
   }
 }
 
+void TabsEventRouter::OnAutoDiscardableStateChange(WebContents* contents,
+                                                   bool is_auto_discardable) {
+  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::kAutoDiscardableKey);
+    DispatchTabUpdatedEvent(contents, std::move(changed_property_names));
+  }
+}
+
 }  // namespace extensions