Make AttachmentServiceImpl clear backoff when reconnected to network.

sync/internal_api/public/attachments/attachment_service_impl.h

 // Copyright 2014 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 SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_SERVICE_IMPL_H_
 #define SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_SERVICE_IMPL_H_
 
 #include <deque>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
+#include "net/base/network_change_notifier.h"
 #include "sync/api/attachments/attachment_store.h"
 #include "sync/internal_api/public/attachments/attachment_downloader.h"
 #include "sync/internal_api/public/attachments/attachment_service.h"
 #include "sync/internal_api/public/attachments/attachment_service_proxy.h"
 #include "sync/internal_api/public/attachments/attachment_uploader.h"
 #include "sync/internal_api/public/attachments/task_queue.h"
 
 namespace syncer {
 
 // Implementation of AttachmentService.
-class SYNC_EXPORT AttachmentServiceImpl : public AttachmentService,
-                                          public base::NonThreadSafe {
+class SYNC_EXPORT AttachmentServiceImpl
+    : public AttachmentService,
+      public net::NetworkChangeNotifier::NetworkChangeObserver,
+      public base::NonThreadSafe {
  public:
   // |attachment_uploader| is optional. If null, attachments will never be
   // uploaded to the sync server and |delegate|'s OnAttachmentUploaded will
   // never be invoked.
   //
   // |attachment_downloader| is optional. If null, attachments will never be
   // downloaded. Only attachments in |attachment_store| will be returned from
   // GetOrDownloadAttachments.
   //
   // |delegate| is optional delegate for AttachmentService to notify about
@@ skipping 23 matching lines @@
   // AttachmentService implementation.
   virtual AttachmentStore* GetStore() OVERRIDE;
   virtual void GetOrDownloadAttachments(
       const AttachmentIdList& attachment_ids,
       const GetOrDownloadCallback& callback) OVERRIDE;
   virtual void DropAttachments(const AttachmentIdList& attachment_ids,
                                const DropCallback& callback) OVERRIDE;
   virtual void UploadAttachments(
       const AttachmentIdSet& attachment_ids) OVERRIDE;
 
+  // NetworkChangeObserver implementation.
+  virtual void OnNetworkChanged(
+      net::NetworkChangeNotifier::ConnectionType type) OVERRIDE;
+
+  // Use |timer| in the underlying TaskQueue.
+  //
+  // Used in tests.  See also MockTimer.
+  void SetTimerForTest(scoped_ptr<base::Timer> timer);
+
  private:
   class GetOrDownloadState;
 
   void ReadDone(const scoped_refptr<GetOrDownloadState>& state,
                 const AttachmentStore::Result& result,
                 scoped_ptr<AttachmentMap> attachments,
                 scoped_ptr<AttachmentIdList> unavailable_attachment_ids);
   void DropDone(const DropCallback& callback,
                 const AttachmentStore::Result& result);
   void UploadDone(const AttachmentUploader::UploadResult& result,
@@ skipping 23 matching lines @@
 
   // Must be last data member.
   base::WeakPtrFactory<AttachmentServiceImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AttachmentServiceImpl);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_SERVICE_IMPL_H_