Refactor fake Connection subclasses in proximity_auth/ tests to a single file.

components/proximity_auth/fake_connection.h

Index: components/proximity_auth/fake_connection.h
diff --git a/components/proximity_auth/fake_connection.h b/components/proximity_auth/fake_connection.h
new file mode 100644
index 0000000000000000000000000000000000000000..8a8732def2b7b8159cd6b1f3d90cb66ae38151ca
--- /dev/null
+++ b/components/proximity_auth/fake_connection.h
@@ -0,0 +1,53 @@
+// 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 COMPONENTS_PROXIMITY_AUTH_FAKE_CONNECTION_H
+#define COMPONENTS_PROXIMITY_AUTH_FAKE_CONNECTION_H
+
+#include "components/proximity_auth/connection.h"
+
+namespace proximity_auth {
+
+// A fake implementation of Connection to use in tests.
+class FakeConnection : public Connection {
+ public:
+  FakeConnection(const RemoteDevice& remote_device);
+  ~FakeConnection() override;
+
+  // Connection:
+  void Connect() override;
+  void Disconnect() override;
+
+  // Completes the current send operation with success |success|.
+  void FinishSendingMessageWithSuccess(bool success);
+
+  // Simulates receiving a wire message with the given |payload|, bypassing the
+  // container WireMessage format.
+  void ReceiveMessageWithPayload(const std::string& payload);
+
+  // Returns the current message in progress of being sent.
+  WireMessage* current_message() { return current_message_.get(); }
+
+  using Connection::SetStatus;
+
+ private:
+  // Connection:
+  void SendMessageImpl(scoped_ptr<WireMessage> message) override;
+  scoped_ptr<WireMessage> DeserializeWireMessage(
+      bool* is_incomplete_message) override;
+
+  // The message currently being sent. Only set between a call to
+  // SendMessageImpl() and FinishSendingMessageWithSuccess().
+  scoped_ptr<WireMessage> current_message_;
+
+  // The payload that should be returned when DeserializeWireMessage() is
+  // called.
+  std::string pending_payload_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakeConnection);
+};
+
+}  // namespace proximity_auth
+
+#endif  // COMPONENTS_PROXIMITY_AUTH_FAKE_CONNECTION_H