[cast_channel] Make cast_channel related files not depend on "cast_channel.h"

components/cast_channel/cast_channel_type.h

Index: components/cast_channel/cast_channel_type.h
diff --git a/components/cast_channel/cast_channel_type.h b/components/cast_channel/cast_channel_type.h
new file mode 100644
index 0000000000000000000000000000000000000000..1a5828d49a86e1bda00edc021071c41b98c898a8
--- /dev/null
+++ b/components/cast_channel/cast_channel_type.h
@@ -0,0 +1,48 @@
+// Copyright 2017 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_CAST_CHANNEL_CAST_CHANNEL_TYPE_H_

[mark a. foltz, 2017/05/24 22:46:36]

Maybe cast_channel_enum.h?

[zhaobin, 2017/05/25 00:49:23]

Done.

+#define COMPONENTS_CAST_CHANNEL_CAST_CHANNEL_TYPE_H_
+
+#include <string>
+
+namespace cast_channel {
+
+// Map to enum ReadyState in cast_channel.idl

[imcheng, 2017/05/24 22:11:23]

s/Map/Maps, here and below.

[zhaobin, 2017/05/25 00:49:23]

Done.

+enum class ReadyState {
+  NONE,
+  CONNECTING,
+  OPEN,
+  CLOSING,
+  CLOSED,
+};
+
+// Map to enum ChannelError in cast_channel.idl
+enum class ChannelError {
+  NONE,
+  CHANNEL_NOT_OPEN,
+  AUTHENTICATION_ERROR,
+  CONNECT_ERROR,
+  SOCKET_ERROR,
+  TRANSPORT_ERROR,
+  INVALID_MESSAGE,
+  INVALID_CHANNEL_ID,
+  CONNECT_TIMEOUT,
+  PING_TIMEOUT,
+  UNKNOWN,
+};
+
+// Map to enum ChannelAuth in cast_channel.idl
+enum class ChannelAuthType {
+  NONE,
+  SSL_VERIFIED,
+};
+
+std::string ToString(ReadyState ready_state);

[imcheng, 2017/05/24 22:11:23]

Prefer ReadyStateToString, ChannelErrorToString, ChannelAuthTypeToString rather
than overloading ToString.

[zhaobin, 2017/05/25 00:49:23]

Done.

+std::string ToString(ChannelError channel_error);
+std::string ToString(ChannelAuthType channel_auth);
+
+}  // namespace cast_channel
+
+#endif  // COMPONENTS_CAST_CHANNEL_CAST_CHANNEL_TYPE_H_