Reland of [Background Sync] Trigger Background Sync events when Chrome is backgrounded on Android

content/browser/background_sync/background_sync_manager.h

 // Copyright 2015 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 CONTENT_BROWSER_BACKGROUND_SYNC_BACKGROUND_SYNC_MANAGER_H_
 #define CONTENT_BROWSER_BACKGROUND_SYNC_BACKGROUND_SYNC_MANAGER_H_
 
 #include <map>
 #include <string>
 #include <utility>
@@ skipping 81 matching lines @@
   // Given a HandleId |handle_id|, return a new handle for the same
   // registration.
   scoped_ptr<BackgroundSyncRegistrationHandle> DuplicateRegistrationHandle(
       BackgroundSyncRegistrationHandle::HandleId handle_id);
 
   // ServiceWorkerContextObserver overrides.
   void OnRegistrationDeleted(int64 sw_registration_id,
                              const GURL& pattern) override;
   void OnStorageWiped() override;
 
+  BackgroundSyncNetworkObserver* GetNetworkObserverForTesting() {
+    return network_observer_.get();
+  }
+
  protected:
   // A registration might be referenced by the client longer than
   // the BackgroundSyncManager needs to keep track of it (e.g., the event has
   // finished firing). The BackgroundSyncManager reference counts its
   // registrations internally and every BackgroundSyncRegistrationHandle has a
   // unique handle id which maps to a locally maintained (in
   // client_registration_ids_) scoped_refptr.
   class RefCountedRegistration;
 
   explicit BackgroundSyncManager(
@@ skipping 244 matching lines @@
         BackgroundSyncRegistrationHandle::HandleId> registration_handle_ids_;
 
   base::WeakPtrFactory<BackgroundSyncManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundSyncManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BACKGROUND_SYNC_BACKGROUND_SYNC_MANAGER_H_