Add a minimal AttachmentUploaderImpl.

sync/internal_api/public/attachments/attachment_uploader_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_UPLOADER_IMPL_H_
+#define SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_UPLOADER_IMPL_H_
+
+#include "base/containers/scoped_ptr_hash_map.h"
+#include "base/threading/non_thread_safe.h"
+#include "net/url_request/url_request_context_getter.h"
+#include "sync/api/attachments/attachment_uploader.h"
+#include "sync/internal_api/public/attachments/attachment_server_url_builder.h"
+
+namespace net {
+class URLRequestContextGetter;
+}  // namespace net
+
+namespace syncer {
+
+// An implementation of AttachmentUploader.
+class SYNC_EXPORT AttachmentUploaderImpl : public AttachmentUploader,
+                                           public base::NonThreadSafe {
+ public:
+  AttachmentUploaderImpl(const AttachmentServerURLBuilder& url_builder,
+                         const scoped_refptr<net::URLRequestContextGetter>&
+                             url_request_context_getter);
+  virtual ~AttachmentUploaderImpl();
+
+  // AttachmentUploader implementation.
+  virtual void UploadAttachment(const Attachment& attachment,
+                                const UploadCallback& callback) OVERRIDE;
+
+ private:
+  class UploadState;
+  typedef std::string UniqueId;
+  typedef base::ScopedPtrHashMap<UniqueId, UploadState> StateMap;
+
+  AttachmentServerURLBuilder url_builder_;
+  scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_;
+  StateMap state_map_;
+  DISALLOW_COPY_AND_ASSIGN(AttachmentUploaderImpl);
+};
+
+}  // namespace syncer
+
+#endif  // SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_UPLOADER_IMPL_H_