[Presentation API] Move Presentation API structs to public/common

content/public/browser/presentation_connection_message.h

-// 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 CONTENT_PUBLIC_BROWSER_PRESENTATION_CONNECTION_MESSAGE_H_
-#define CONTENT_PUBLIC_BROWSER_PRESENTATION_CONNECTION_MESSAGE_H_
-
-#include <stdint.h>
-
-#include <memory>
-#include <string>
-#include <vector>
-
-#include "content/common/content_export.h"
-
-namespace content {
-
-enum PresentationMessageType {
-  TEXT,
-  BINARY,
-};
-
-// Represents a presentation connection message.
-// If this is a text message, |data| is null; otherwise, |message| is null.
-// Empty messages are allowed.
-struct CONTENT_EXPORT PresentationConnectionMessage {
- public:
-  explicit PresentationConnectionMessage(PresentationMessageType type);
-  ~PresentationConnectionMessage();
-
-  bool is_binary() const;
-  const PresentationMessageType type;
-  std::string message;
-  std::unique_ptr<std::vector<uint8_t>> data;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_PUBLIC_BROWSER_PRESENTATION_CONNECTION_MESSAGE_H_