Blimp: Add BlobChannel Helium messages and delegate impls.

blimp/net/blob_channel/helium_blob_sender_delegate.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_HELIUM_BLOB_SENDER_DELEGATE_H_
+#define BLIMP_NET_BLOB_CHANNEL_HELIUM_BLOB_SENDER_DELEGATE_H_
+
+#include <string>
+#include <vector>
+
+#include "blimp/net/blimp_message_processor.h"
+#include "blimp/net/blimp_net_export.h"
+#include "blimp/net/blob_channel/blob_channel_receiver.h"
+#include "blimp/net/blob_channel/blob_channel_sender.h"
+
+namespace blimp {
+
+// Sends blob messages as Helium messages to a BlimpMessageProcessor.
+class BLIMP_NET_EXPORT HeliumBlobSenderDelegate
+    : public BlobChannelSender::Delegate,
+      public BlimpMessageProcessor {
+ public:
+  HeliumBlobSenderDelegate();
+  ~HeliumBlobSenderDelegate() override;
+
+  // Sets the message processor which will process the output of |this|.

[Wez, 2016/05/20 21:46:18]

nit: "... processor to which blob messages will be sent."?

[Kevin M, 2016/05/23 20:48:08]

Done.

+  void set_outgoing_message_processor(
+      std::unique_ptr<BlimpMessageProcessor> processor) {
+    outgoing_processor_ = std::move(processor);
+  }
+
+  // BlobSender::Delegate implementation.
+  void DeliverBlob(const BlobId& id, BlobDataPtr data) override;
+
+ private:
+  // BlimpMessageProcessor implementation.
+  void ProcessMessage(std::unique_ptr<BlimpMessage> message,
+                      const net::CompletionCallback& callback) override;
+
+  std::unique_ptr<BlimpMessageProcessor> outgoing_processor_;
+
+  DISALLOW_COPY_AND_ASSIGN(HeliumBlobSenderDelegate);
+};
+
+}  // namespace blimp
+
+#endif  // BLIMP_NET_BLOB_CHANNEL_HELIUM_BLOB_SENDER_DELEGATE_H_