extensions/browser/event_page_tracker.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef EXTENSIONS_BROWSER_EVENT_PAGE_TRACKER_H_
   6 #define EXTENSIONS_BROWSER_EVENT_PAGE_TRACKER_H_
   7
   8 #include <string>
   9
  10 #include "base/callback.h"
  11
  12 namespace extensions {
  13
  14 class Extension;
  15 class ExtensionHost;
  16
  17 // Tracks an extension's event page suspend state.
  18 class EventPageTracker {
  19  public:
  20   // Returns true if an extension's event page is active,
  21   // or false if it is suspended.
  22   virtual bool IsEventPageSuspended(const std::string& extension_id) = 0;
  23
  24   // Wakes an extension's event page from a suspended state and calls
  25   // |callback| after it is reactivated.
  26   //
  27   // |callback| will be passed true if the extension was reactivated
  28   // successfully, or false if an error occurred.
  29   //
  30   // Returns true if a wake operation was scheduled successfully,
  31   // or false if the event page was already awake.
  32   // Callback will be run asynchronously if true, and never run if false.
  33   virtual bool WakeEventPage(const std::string& extension_id,
  34                              const base::Callback<void(bool)>& callback) = 0;
  35 };
  36
  37 }  // namespace extensions
  38
  39 #endif  // EXTENSIONS_BROWSER_EVENT_PAGE_TRACKER_H_