[Blimp Net] Add EngineAuthHandler.

blimp/net/test_common.h

Index: blimp/net/test_common.h
diff --git a/blimp/net/test_common.h b/blimp/net/test_common.h
index 58ee2f6a5c3a0b792c0d93ca1716452befa584de..b42c3d82c8209e8093696644a2be91a2c738381d 100644
--- a/blimp/net/test_common.h
+++ b/blimp/net/test_common.h
@@ -9,6 +9,7 @@
 
 #include "base/memory/scoped_ptr.h"
 #include "blimp/common/proto/blimp_message.pb.h"
+#include "blimp/net/blimp_connection.h"
 #include "blimp/net/blimp_message_processor.h"
 #include "blimp/net/blimp_transport.h"
 #include "blimp/net/connection_error_observer.h"
@@ -165,6 +166,20 @@ class MockPacketWriter : public PacketWriter {
                     const net::CompletionCallback&));
 };
 
+class MockBlimpConnection : public BlimpConnection {
+ public:
+  MockBlimpConnection();
+  ~MockBlimpConnection() override;
+
+  MOCK_METHOD1(SetConnectionErrorObserver,
+               void(ConnectionErrorObserver* observer));
+
+  MOCK_METHOD1(SetIncomingMessageProcessor,
+               void(BlimpMessageProcessor* processor));
+
+  MOCK_CONST_METHOD0(GetOutgoingMessageProcessor, BlimpMessageProcessor*());
+};
+
 class MockConnectionErrorObserver : public ConnectionErrorObserver {
  public:
   MockConnectionErrorObserver();