Blimp: Add BlobChannelSender implementation

blimp/net/blob_channel/types.h

+// Copyright 2016 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 BLIMP_NET_BLOB_CHANNEL_TYPES_H_
+#define BLIMP_NET_BLOB_CHANNEL_TYPES_H_
+
+#include <string>
+#include <vector>
+
+#include "base/memory/ref_counted.h"
+
+namespace blimp {
+
+using BlobData =
+    scoped_refptr<base::RefCountedData<std::vector<uint8_t>>>;
+
+using BlobId = std::string;
+
+}  // namespace blimp
+
+#endif  // BLIMP_NET_BLOB_CHANNEL_TYPES_H_