mash: Change CastConfigDelegate to a mojoified CastConfigClient.

ash/common/cast_config_controller.h

Index: ash/common/cast_config_controller.h
diff --git a/ash/common/cast_config_controller.h b/ash/common/cast_config_controller.h
new file mode 100644
index 0000000000000000000000000000000000000000..38806e1af6817cc9c8076f1d7ae8612199041400
--- /dev/null
+++ b/ash/common/cast_config_controller.h
@@ -0,0 +1,68 @@
+// 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_CONTROLLER_H_
+#define ASH_COMMON_CAST_CONFIG_CONTROLLER_H_
+
+#include <vector>
+
+#include "ash/public/interfaces/cast_config.mojom.h"
+#include "base/macros.h"
+#include "mojo/public/cpp/bindings/associated_binding.h"
+#include "mojo/public/cpp/bindings/binding_set.h"
+
+namespace ash {
+
+// There is a single CastConfigController which receives device
+// information. This observer interface sends that information to all the
+// TrayCast items--there is one per display.
+class CastConfigControllerObserver {
+ public:
+  virtual void OnDevicesUpdated(
+      std::vector<mojom::SinkAndRoutePtr> devices) = 0;
+
+ protected:
+  virtual ~CastConfigControllerObserver() {}
+};
+
+// We want to establish our connection lazily and preferably only once, as
+// TrayCast instances will come and go.
+class CastConfigController : public ash::mojom::CastConfig,
+                             public ash::mojom::CastConfigClient {
+ public:
+  CastConfigController();
+  ~CastConfigController() override;
+
+  // Returns whether our SetClient() method has been called and the client
+  // object pointer is still live.
+  bool Connected();
+
+  void AddObserver(CastConfigControllerObserver* observer);
+  void RemoveObserver(CastConfigControllerObserver* observer);
+
+  void BindRequest(mojom::CastConfigRequest request);
+
+  // ash::mojom::CastConfig:
+  void SetClient(mojom::CastConfigClientAssociatedPtrInfo client) override;
+  void OnDevicesUpdated(std::vector<mojom::SinkAndRoutePtr> devices) override;
+
+  // ash::mojom::CastConfigClient:
+  void RequestDeviceRefresh() override;
+  void CastToSink(mojom::CastSinkPtr sink) override;
+  void StopCasting(mojom::CastRoutePtr route) override;
+
+ private:
+  // Bindings for the CastConfig interface.
+  mojo::BindingSet<mojom::CastConfig> bindings_;
+
+  mojom::CastConfigClientAssociatedPtr client_;
+
+  base::ObserverList<CastConfigControllerObserver> observers_;
+
+  DISALLOW_COPY_AND_ASSIGN(CastConfigController);
+};
+
+}  // namespace ash
+
+#endif  // ASH_COMMON_CAST_CONFIG_CONTROLLER_H_