[BackgroundSync] 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 82 matching lines @@
 
   void GetRegistrations(int64 sw_registration_id,
                         SyncPeriodicity periodicity,
                         const StatusAndRegistrationsCallback& callback);
 
   // ServiceWorkerContextObserver overrides.
   void OnRegistrationDeleted(int64 registration_id,
                              const GURL& pattern) override;
   void OnStorageWiped() override;
 
+  BackgroundSyncNetworkObserver* GetNetworkObserverForTesting() {
+    return network_observer_.get();
+  }
+
  protected:
   explicit BackgroundSyncManager(
       const scoped_refptr<ServiceWorkerContextWrapper>& context);
 
   // Init must be called before any public member function. Only call it once.
   void Init();
 
   // The following methods are virtual for testing.
   virtual void StoreDataInBackend(
       int64 sw_registration_id,
@@ skipping 189 matching lines @@
   scoped_ptr<BackgroundSyncPowerObserver> power_observer_;
 
   base::WeakPtrFactory<BackgroundSyncManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundSyncManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BACKGROUND_SYNC_BACKGROUND_SYNC_MANAGER_H_