Add interfaces for most major Blimp net components.

blimp/net/blimp_message_dispatcher.h

Index: blimp/net/blimp_message_dispatcher.h
diff --git a/blimp/net/blimp_message_dispatcher.h b/blimp/net/blimp_message_dispatcher.h
index bf12449df16c8931056a67060abdba45ba3570f8..e4f3dd6698d19e48a3e96280b318d1074ad28298 100644
--- a/blimp/net/blimp_message_dispatcher.h
+++ b/blimp/net/blimp_message_dispatcher.h
@@ -10,14 +10,14 @@
 #include "base/containers/small_map.h"
 #include "base/threading/thread_checker.h"
 #include "blimp/common/proto/blimp_message.pb.h"
-#include "blimp/net/blimp_message_receiver.h"
+#include "blimp/net/blimp_message_processor.h"
 #include "blimp/net/blimp_net_export.h"
 
 namespace blimp {
 
-// Multiplexing BlimpMessageReceiver which routes BlimpMessages to other
-// receivers based on the messages' feature type.
-class BLIMP_NET_EXPORT BlimpMessageDispatcher : public BlimpMessageReceiver {
+// Multiplexing BlimpMessageProcessor which routes BlimpMessages to other
+// processors based on the messages' feature type.
+class BLIMP_NET_EXPORT BlimpMessageDispatcher : public BlimpMessageProcessor {
  public:
   BlimpMessageDispatcher();
   ~BlimpMessageDispatcher() override;
@@ -27,13 +27,14 @@ class BLIMP_NET_EXPORT BlimpMessageDispatcher : public BlimpMessageReceiver {
   // Only one handler may be added per type.
   //
   // |handler| must be valid when OnBlimpMessage() is called.
-  void AddReceiver(BlimpMessage::Type type, BlimpMessageReceiver* handler);
+  void AddReceiver(BlimpMessage::Type type, BlimpMessageProcessor* handler);
 
-  // BlimpMessageReceiver implementation.
-  net::Error OnBlimpMessage(const BlimpMessage& message) override;
+  // BlimpMessageProcessor implementation.
+  void ProcessMessage(const BlimpMessage& message,
+                      const net::CompletionCallback& callback) override;
 
  private:
-  base::SmallMap<std::map<BlimpMessage::Type, BlimpMessageReceiver*>>
+  base::SmallMap<std::map<BlimpMessage::Type, BlimpMessageProcessor*>>
       feature_receiver_map_;
 
   DISALLOW_COPY_AND_ASSIGN(BlimpMessageDispatcher);