Add interfaces for most major Blimp net components.

blimp/net/blimp_message_multiplexer.h

Index: blimp/net/blimp_message_multiplexer.h
diff --git a/blimp/net/blimp_message_multiplexer.h b/blimp/net/blimp_message_multiplexer.h
new file mode 100644
index 0000000000000000000000000000000000000000..1856a08dde8a98a8a58f65380435efa2d7e9a491
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+++ b/blimp/net/blimp_message_multiplexer.h
@@ -0,0 +1,59 @@
+// 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 BLIMP_NET_BLIMP_MESSAGE_MULTIPLEXER_H_
+#define BLIMP_NET_BLIMP_MESSAGE_MULTIPLEXER_H_
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "blimp/common/proto/blimp_message.pb.h"
+#include "blimp/net/blimp_message_processor.h"
+#include "blimp/net/blimp_net_export.h"
+#include "net/base/completion_callback.h"
+
+namespace blimp {
+
+class BlimpConnection;
+class BlimpMessageBuffer;
+
+// Creates MessageProcessors that take outgoing messages and multiplex them
+// on to a single output message processor.
+class BLIMP_NET_EXPORT BlimpMessageMultiplexer : private BlimpMessageProcessor {
+ public:
+  explicit BlimpMessageMultiplexer(scoped_ptr<BlimpMessageProcessor> output);
+
+  ~BlimpMessageMultiplexer() override;
+
+  // Creates a BlimpMessageProcessor object that may only receive messages of
+  // type |type|. This object is used by features for sending messages.
+  scoped_ptr<BlimpMessageProcessor> CreateProcessorForType(
+      BlimpMessage::Type type);
+
+ private:
+  class MultiplexedSender : public BlimpMessageProcessor {
+   public:
+    MultiplexedSender(BlimpMessageBuffer* output, BlimpMessage::Type type);
+
+    ~MultiplexedSender() override;
+
+    // BlimpMessageProcessor implementation.
+    void ProcessMessage(const BlimpMessage& message,
+                        const net::CompletionCallback& callback) override;
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(MultiplexedSender);
+  };
+  friend class MultiplexedSender;
+
+  // BlimpMessageProcessor implementation.
+  // Private linkage so that only MultiplexedSender may call it.
+  void ProcessMessage(const BlimpMessage& message,
+                      const net::CompletionCallback& callback) override;
+
+  DISALLOW_COPY_AND_ASSIGN(BlimpMessageMultiplexer);
+};
+
+}  // namespace blimp
+
+#endif  // BLIMP_NET_BLIMP_MESSAGE_MULTIPLEXER_H_