binder: Move CertificateFormat to its own header

/*

 * Copyright (C) 2021 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

// Formats for serializing TLS certificate.

#pragma once

namespace android {

enum class CertificateFormat {

    PEM,

    // TODO(b/195166979): support other formats, e.g. DER

};

} // namespace android

#include <android-base/unique_fd.h>

#include <utils/Errors.h>

#include <binder/CertificateFormat.h>

namespace android {

class FdTrigger;

enum class CertificateFormat {

    PEM,

    // TODO(b/195166979): support other formats, e.g. DER

};

// Represents a socket connection.

// No thread-safety is guaranteed for these APIs.

class RpcTransport {