Adding Discarded property support for onUpdate function.

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

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_TABS_TABS_EVENT_ROUTER_H_
 #define CHROME_BROWSER_EXTENSIONS_API_TABS_TABS_EVENT_ROUTER_H_
 
 #include <map>
 #include <set>
 #include <string>
 
 #include "base/macros.h"
 #include "base/scoped_observer.h"
 #include "chrome/browser/extensions/api/tabs/tabs_api.h"
+#include "chrome/browser/memory/tab_manager.h"
+#include "chrome/browser/memory/tab_manager_observer.h"
 #include "chrome/browser/ui/browser_list_observer.h"
 #include "chrome/browser/ui/browser_tab_strip_tracker.h"
 #include "chrome/browser/ui/browser_tab_strip_tracker_delegate.h"
 #include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
 #include "components/favicon/core/favicon_driver_observer.h"
 #include "components/zoom/zoom_observer.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "extensions/browser/event_router.h"
 
 namespace content {
 class WebContents;
 }
 
 namespace favicon {
 class FaviconDriver;
 }
 
 namespace extensions {
 
 // The TabsEventRouter listens to tab events and routes them to listeners inside
 // extension process renderers.
 // TabsEventRouter will only route events from windows/tabs within a profile to
 // extension processes in the same profile.
 class TabsEventRouter : public TabStripModelObserver,
                         public BrowserTabStripTrackerDelegate,
                         public chrome::BrowserListObserver,
                         public favicon::FaviconDriverObserver,
-                        public zoom::ZoomObserver {
+                        public zoom::ZoomObserver,
+                        public memory::TabManagerObserver {
  public:
   explicit TabsEventRouter(Profile* profile);
   ~TabsEventRouter() override;
 
   // BrowserTabStripTrackerDelegate:
   bool ShouldTrackBrowser(Browser* browser) override;
 
   // chrome::BrowserListObserver:
   void OnBrowserSetLastActive(Browser* browser) override;
 
@@ skipping 28 matching lines @@
   void OnZoomChanged(
       const zoom::ZoomController::ZoomChangedEventData& data) override;
 
   // favicon::FaviconDriverObserver:
   void OnFaviconUpdated(favicon::FaviconDriver* favicon_driver,
                         NotificationIconType notification_icon_type,
                         const GURL& icon_url,
                         bool icon_url_changed,
                         const gfx::Image& image) override;
 
+  // memory::TabManagerObserver:
+  void OnDiscardedStateChange(content::WebContents* contents,
+                              bool is_discarded) override;
+
  private:
   // "Synthetic" event. Called from TabInsertedAt if new tab is detected.
   void TabCreatedAt(content::WebContents* contents, int index, bool active);
 
   // Internal processing of tab updated events. Intended to be called when
   // there's any changed property.
   class TabEntry;
   void TabUpdated(TabEntry* entry,
                   std::set<std::string> changed_property_names);
 
@@ skipping 88 matching lines @@
   TabEntryMap tab_entries_;
 
   // The main profile that owns this event router.
   Profile* profile_;
 
   ScopedObserver<favicon::FaviconDriver, TabsEventRouter>
       favicon_scoped_observer_;
 
   BrowserTabStripTracker browser_tab_strip_tracker_;
 
+  ScopedObserver<memory::TabManager, TabsEventRouter>
+      tab_manager_scoped_observer_;
+
   DISALLOW_COPY_AND_ASSIGN(TabsEventRouter);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_TABS_TABS_EVENT_ROUTER_H_