mash: Change CastConfigDelegate to a mojoified CastConfigClient.

ash/common/cast_config_client_proxy.h

Index: ash/common/cast_config_client_proxy.h
diff --git a/ash/common/cast_config_client_proxy.h b/ash/common/cast_config_client_proxy.h
new file mode 100644
index 0000000000000000000000000000000000000000..14cf7c43df8bb9eb587249cf2dcb8794081aab5a
--- /dev/null
+++ b/ash/common/cast_config_client_proxy.h
@@ -0,0 +1,57 @@
+// 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 ASH_COMMON_CAST_CONFIG_CLIENT_PROXY_H_
+#define ASH_COMMON_CAST_CONFIG_CLIENT_PROXY_H_
+
+#include "ash/public/interfaces/cast_config.mojom.h"
+#include "base/macros.h"
+#include "mojo/public/cpp/bindings/associated_binding.h"
+
+namespace service_manager {
+class Connector;
+}
+
+namespace ash {
+
+// We want to establish our connection lazily and preferably only once, as
+// TrayCast instances will come and go.
+class CastConfigClientProxy : public ash::mojom::CastConfigClient {
+ public:
+  CastConfigClientProxy(service_manager::Connector* connector);

[James Cook, 2016/11/30 22:16:38]

explicit

+  ~CastConfigClientProxy() override;
+
+  // Binds an AssociatedBinding to the associated group of our pipe, and passes
+  // the result to AddObserver().
+  void AddObserverBinding(
+      mojo::AssociatedBinding<mojom::CastConfigObserver>* observer_binding);
+
+  // Returns whether we can connect to the remote client. This is used to
+  // ensure that UI elements are hidden when no connection to the remote
+  // client is possible.
+  bool CanConnect();
+
+  // ash::mojom::CastConfigClient:
+  void RequestDeviceRefresh() override;
+  void CastToSink(mojom::CastSinkPtr sink) override;
+  void StopCasting(mojom::CastRoutePtr route) override;
+  void AddObserver(
+      mojom::CastConfigObserverAssociatedPtrInfo observer) override;
+
+ private:
+  // Ensures that we have a valid |client_| before we try to use it.
+  bool ConnectToClient();
+
+  // Clears |client_| when |client_| has a connection error.
+  void OnClientConnectionError();
+
+  service_manager::Connector* connector_;
+  mojom::CastConfigClientPtr client_;
+
+  DISALLOW_COPY_AND_ASSIGN(CastConfigClientProxy);
+};
+
+}  // namespace ash
+
+#endif  // ASH_COMMON_CAST_CONFIG_CLIENT_PROXY_H_