remoting: Extract the utility to get the BytesPerPixel from PixelFormat into a function.

remoting/base/protocol_util.h

 // Copyright (c) 2010 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 REMOTING_BASE_PROTOCOL_UTIL_H_
 #define REMOTING_BASE_PROTOCOL_UTIL_H_
 
 #include "google/protobuf/message_lite.h"
 #include "media/base/data_buffer.h"
+#include "remoting/base/protocol/chromotocol.pb.h"
 
 // This file defines utility methods used for encoding and decoding the protocol
 // used in Chromoting.
 namespace remoting {
 
 // Serialize the Protocol Buffer message and provide sufficient framing for
 // sending it over the wire.
 // This will provide sufficient prefix and suffix for the receiver side to
 // decode the message.
 scoped_refptr<media::DataBuffer> SerializeAndFrameMessage(
     const google::protobuf::MessageLite& msg);
 
+int GetBytesPerPixel(PixelFormat format);
+
 }  // namespace remoting
 
 #endif  // REMOTING_BASE_PROTOCOL_UTIL_H_